I have tons of those stupid phrase T shirts. My fave says Nice then has a pic of a Beaver next to it. So many people cant tell its a beaver and they say, Nice Turtle! HUH!
I've got an old one that says "My god can beat up your god", man do the religious freaks take that as more than just a joke!
I had an old White Zombie shirt when I was like 17 that said "Say you love Satan...666" and another that said "666, Mutha F***a!" but, again, people get way too upset about that dumb stuff.
The best I ever saw was years ago, when my boss (then) bought his flat-chested girlfriend a shirt that said on the back, "In case of rape-flip over."