There were times that the Master regretted the fact that the Chameleon circuit on his TARDIS was fully functional. This was one of those times. As it was, he felt like slamming his head against the nearest wall.

"Hey! Open up man! You've been in there for like an hour!" came another yell followed by more of the pounding that had disrupted a rather sensitive experiment.

And the Doctor says I have absolutely no compassion for my fellow beings throughout the universe the Master thought as he opened his door with a sigh.

"The bathroom's upstairs, the third door on the right. If you pee somewhere other than the bathroom, I'll kill you. If you make a mess in the bathroom, I'll make you clean it up, then I'll kill you." The Master said to the guy who had been pounding on his door for the last fifteen minutes.

"The same goes for the rest of you!" he yelled to the long line that had been standing behind the man.

Sometimes he thought that his TARDIS turned into a Porta Potty so often just to spite him.