I've always liked the T-shirt with a pic of two vultures sitting on a treelimb and one says to the other one (captioned) "Patience, HELL!! I want to kill something!"
Then there was the time when I pulled up to a traffic light during rush hour and leisurely sat there waiting for the light to change.......when I glanced down and noticed the bumper sticker on the car in front of me......"What if everyone in the world farted at the same time?" I almost peed my pants laffing!