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?"