So, just sort of a side-story. Came up with the idea when I was working with liquid nitrogen in the lab. Hope people enjoy.

"FROST!" an outraged yell rang from the Art building, ringing through the campus to where Jack could even hear it in the Chemistry building. He just rolled his eyes and leaned back in his chair.

It was only a couple of days until the semester began, but Jack Frost was already bored. And what better way to deal with it other than pestering the easily irritated Art professor?

It was so easy, it was almost even more boring than doing nothing.

A large man slammed open the door to his study, marching over to the desk to tower ominously over him.

"Heya, Kangaroo," he smirked at him, leaning back in his seat to prop his bare feet on the desk, "What brings you to my neck of the woods? Want to see what REAL work looks like?"

Bunnymund slammed his fists down on the desk, making the various instruments shake. Jack refused to give the older man the satisfaction of making sure none of them fell, so just kept his ice blue eyes on the other's emerald green.

"Real work, eh? As far as I can see, you don't do anything worth the college taking you on for! I guess this is what we get for taking in a kid the same age as his students. Like they could really learn anything from you."

"Ooh," Jack leaned forward, bringing his face close the furious art teacher's, "I'm shaking in my…" he took a quick glance down, "…my metaphorical boots."

Bunnymund snorted, "I'm surprised that you even know what that word means."

"Eh, I guess that the humanities are good for something, after all."

"The students are going to EAT YOU ALIVE."

"Really, even the vegetarians? The vegans?"

"Just because you're some sort of prodigy doesn't mean…"

"Oh, I think it means that exactly," Jack leaned back in his chair again, "If you intend to stay, would you mind closing the door? You're letting the heat in."

"The heat would do you good," Bunymund made no move for the door, except for a slight shiver from the chill, "Maybe it would make you into a real person or something."

"Nah, I kinda like it like this. Reality is overrated anyways."

"You're going to end up with frostbite or something."

"Oh, Bunny! It's almost like you care!"

Bunnymund just swiped Jack's feet off the desk and stomped out of the room.

"Close the door!"

It was ignored.

Jack just sat there in silence before sighing, walking over to close and lock the door.

He leaned back on the door, slid down to the floor.

So bored.

He heard a beep from his phone.

Oh right, the doctor appointment. Can't forget that.

…

"Shirt off, Mister Frost, you know the drill."

Sighing, Jack did as he was told. He flinched slightly as the cold metal of the stethoscope brushed against his back.

"How rude. I did extra work to make sure this was cold enough for you."

"It's about 200 degrees outside! Therefore, a bit of a shock."

"More like 90. So I'm guessing no luck so far?"

Jack tilted his head back to stare at the ceiling.

"None. How's Emily?"

"Excited. She's in college now after all. Same school as you. And she's already managed to get control of a hip hop class at the rec center."

"I guess I'll have to check it out, then."

A sigh, "Enough small talk, Jack. You don't have much time left."

"No duh, Doctor Obvious," Jack flinched as the doctor lightly placed a tourniquet his arm, "Do we really have to stick me again?"

"Sorry."

"No you're not. In fact, Doc, I don't think you have it in you to be sorry. Your heart's pitch black, isn't it?"

"I do wish you'd stop using that joke."

"No way, Kozmo!" Jack grinned cheerfully at him as his arm was swabbed down, "It's not old yet."

"To me, it's turned into vinegar," Doctor Pithnier frowned as he slid the needle into the crook of Jack's elbow. The boy managed not to flinch, but it was a struggle.

"I hate this part," Jack refused to look anywhere near the vial of his own blood.

"No one does."

"Why do I need these anyways? We all know that I'm going to die soon anyways, right?"

"I thought I was supposed to be the pessimistic one."

"Not pessimism. Simple fact."

"It's not hopeless. Not yet."

Jack suddenly let out a loud laugh, "I feel like this situation is backwards. Forgive me, I keep forgetting that I just have to keep trying."

"If I were to let you give up, I'm afraid an evil mob would hunt down this Bogeyman."

"Aw, you're not still upset about what I called you when I was five, are you?"

"Your ceaseless screaming certainly didn't help my reputation."

"Eh, I thought you got over that!"

"Be serious Jack," Pitch was suddenly right there, looking him directly in the eye, "Do you want to try another surgery? Maybe this time…"

"I can't," the mirth vanished from Jack's face, "I've got a class to teach."

"You just need a few days over the weekend to bounce back. It's best to have it done sooner rather than later."

Jack sighed, but nodded, "Fine. Next weekend."

…

Jack felt the corners of his lips twitching in glee, so he turned his back to the students still trickling in to hide it.

Oh, he definitely had plans to make a big impression for the first class. Oh, all of the naïve little general chemistry students. Most of them wouldn't even continue on to obtain a major in his field. Probably at least half were biology students (in fact, he could see Emily Jane in the audience, laughing with her newfound friends, yet somehow still appearing completely serene). Another good chunk were from the…humanities, just taking this to fulfill some requirement or other, not because they were interested in the beauty of chemistry.

That, and the fact that none of them had any clue just how old he was. None of them had seen his face as of yet, and his white hair was sure to make them think he was much older. He guessed that was one benefit of his sudden lack of melanin production. It had so many possibilities for fun.

He eyed the large dewar of liquid nitrogen on the lecture desk. The only thing that made him sad was that only a few people (i.e. the front row) would be able to really see his little…trick.

Oh well. Perhaps this would teach people a lesson about occupying the back row in order to goof off.

"Welcome class!" he spoke out, feeling the microphone on his hoodie magnify his voice to fill the hall. Immediately all eyes were on him…and all were puzzled as they took in his young face, "I am Professor Frost. You will address me as such. And this is General Chemistry. If you are not supposed to be here, get out now."

A few people in the back slunk out at that, and Jack fought back a derisive snort. It was sad really, how people seemed unable to find their class at times. The numbers were on the door after all.

"Now, to start off, we're going to play a little game," he let the mischievous grin cross his face, and watched the people in the front row move uneasily. Ah, they still hadn't accepted him as the professor, not really.

Out of the corner of his eye, he saw Bunnymund at the door, watching.

Waiting for him to screw this up.

Jack pressed his lips together. That overgrown rabbit would be proven wrong.

He vaulted up onto his desk, wiggling his bare toes as he glanced around the hall.

His eyes settled on one of the girls in the front of the row, her face a mask of confusion, "Is something wrong, miss…"

"Katherine," she spoke up, "Where's the REAL Professor Frost?"

"You're looking at him," he stretched his arms over his head, "Yeah, I look pretty young, don't I? Would you believe Fountain of Youth?"

"No…"

"Smart girl. But the fact remains that I AM Professor Frost, Miss Katherine. And you would do well to remember that," he directed his attention to the whole class, "As would all of you. I am not your friend, I am not your 'buddy'. I am your professor, your grades are in my hands."

All was quiet, "Now, who wants to see a little trick?"

Nothing.

"Oh come on, you're all too shy!" he plopped the dewar onto the desk next to him, "Miss Katherine, please come up to the front. I know that you're not overly shy, at least!"

Stiffly, she got to her feet, and walked over to the desk.

He whipped off the Styrofoam lid, allowing the gas to start flowing out, flowing everywhere.

"Do you know what this is, Miss Katherine?"

"Liquid nitrogen?"

"Very good," he nodded sagely, "Someone that's not Miss Katherine, what does liquid nitrogen do to objects…you?"

He pointed to someone midway up, who looked startled at being called upon.

"…it freezes stuff?"

"Well…that's one way of putting it," his lips bent down in a frown at the thoroughly inelegant phrasing, "So what does it do to human flesh?" he pointed at random to another person.

"Gives you frostbite!" they were happy to yell out, looking proudly at their friends, "Makes your body part fall off!"

"Oh really? Are you sure?"

"Of course! Everyone knows that!"

Jack smirked. All was going according to plan.

"Shall we put that to the test then? Katherine, do you agree that the liquid nitrogen is up to the top of the dewar?"

You could practically here crickets chirping. She peered in, "It is…"

"So there's no way for my hand to avoid it if I put it in?"

"…no…"

The whispers were starting as what he was saying started to sink in.

"Excellent," it looked like it was finally sinking in, just what he was planning to do, "So if I stick my hand in…"

And to the shock of everyone, he plunged his hand in, leaving it in for a few seconds before yanking it back out.

"Don't try this at home, kids," he smirked at them, flexing his hand to show that it was quite all right, "I'm a trained professional." He looked around the room, taking in the aghast faces. He especially took pleasure in seeing the horrified face Bunnymund had.

"But…your hand should be frozen!" Katherine exclaimed, staring with huge eyes.

He cocked an eyebrow at her, "Should it now?" He cupped his hand and splashed a bit at her, laughing slightly at her squeal as the volatile fluid hit her and immediately evaporated. Then he took the whole dewar and dumped it on the floor, watching the entire first row immediately snatch up their feet as it rolled toward them.

"Ladies and gentlemen, you've been a wonderful audience," he rose to his feet, standing on his lecture desk as he bowed, "Now onto business."

Just to be clear, it IS possible to put your hand in liquid nitrogen without it freezing off. My professor's done in, much to my shock. He's even splashed a bit at us. I'll leave the research part up to you, just how this is possible. It's really quite cool to watch~!

If I get good feedback, I'll consider continuing this story, so please review!