USAG sells clothes that are good quality, but with graphics that are very tongue in cheek. Their logos include a guy holding a club drinking a beer, a guy taking a drop, a guy with his pants around his ankles relieving himself and my personal favorite, a guy breaking a club over his knee.
(EDIT) BTW - I'm not associated with USAG in any way, other than being a customer of some shirts. As frequently as we hear golf referred to as a silly game, I have to admit I rather enjoy wearing something silly like their shirts.