Costume party

A guy goes into a costume shop. He says,
"I'm going to a costume party, 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. He says, "Still not big enough. "
She says, "Listen, Ace, why don't you just throw it over your shoulder and go as a gasoline pump? "