BRB dead

Is there some unwritten rule that you can't escape from a convention without a virus? I've noticed that a lot of people I know get the "con crud" upon returning from DragonCon, Comic Con, PAX, all them big hitters... But really, is it fair that I have to feel like I've got the plague because I visited a measly little comics festival for a couple of hours yesterday? Uuughvhlurghaaargh.

Fever. Headache. Freezing. And two days to finish up my work for Trivial Pursuit. Jeez.