I have a tradition that dates back to high school where I don't shave* for the duration of exam time (studying and the actual test). Currently, I'm studying for the bar exam, so I'm a wooly beast once again - and this beard itches. But it's only for another month and a half.
I think just for shits and giggles I'll keep the mustache for a day or two after the bar. I figure that I'll look like, as George Costanza says, an out of work porn actor.
*except for my throat; I don't want to look too nasty.