A/N: You know when you're trying to write one thing in particular, and you can write literally anything but? That's me right now. I was trying to write Thinking, and this came out instead. I blame this story on my little brother, for having P&F on in the first place.

Goodness, though, I'm terrible. Phineas and Ferb is one of the most light-hearted, carefree shows ever, and here I am shoving darkness in it. I just wanted Ferb to say the catchphrase for once, and this immediately leaped into my mind, demanding to be written. Sorry, guys. Review anyway?

I probably won't continue this, but who knows? It might happen, if other drabbles pounce on me.

Be the reason someone smiles today! :)

Everyone has those days.

For Phineas, they're few and far between, but all the darker for it. So heavy, it's hard to even get out of bed, to do anything. Hard to think, to be who he is.

It's almost the worst thing he can imagine, but not quite.

Because even in the moments of darkness, of fog, frustration, of nothing being in his mind and hating it, there's Ferb. The one person who always understands.

"Come on, Phineas," he says, guiding his brother into a silent room full of books and sunshine. "I know what we're gonna do today."