A guy goes into a costume shop. He says, "I'm going to a costume party and I want to go as Adam."
The girl brings out a fig leaf. He says, "Not big enough." She brings out a bigger one. He says, "Still not big enough." She brings out a huge fig leaf (the biggest one in the costume shop). But he still complains, "It's just not big enough."
Frustrated she says, "Listen, Ace, why don't you just throw it over your shoulder and go as a gasoline pump?"
