McQuillan walks into a bar and orders martini after martini, each time removing the olives and placing them in a jar.  When the jar is filled with olives and all the drinks are downed, the Irishman starts to leave.

"S'cuse me," says a customer, who is puzzled over what McQuillan has done.  "What was that all about?"

"Nothin'," says the Irishman.  "My wife just sent me out for a jar of olives."