GRRRR--that's a great question.
I actually gave that some thought before I posted.
I would screw up my courage, more like my rage and say something like:
"Hey, d*ckhead, how come you're not wearing an orange jumpsuit that says "Fort Leavenworth" on it?"
Since that opportunity may never come, I may have to just bide my time and pee my brains out over a little patch of Arkansas in the future.
Yeah, someday he WILL get his just desserts...
I'm thinking of a water balloon filled with stuff...
Surely he's heard worse, in his time. He might have a witty answer to your question at the ready, and then your head would explode. :-\