I think an amusing yet esoteric slogan for a shirt would be "Harry Whittington Shot First." I also think a great name for a dessert at a politically-charged event would be "Heckuva Job" Brownies.

I am a terrible person.

(Another great shirt would be "All I need to know about sex I learned from Fanfiction.net", inspired by a recent entry in Renata's blog)

P.S. Renata = HOTT. With two Ts, as is customary.