Olives

A guy sits down at the bar and orders a Martini with two olives. Bartender gives him the drink, he takes out the two olives, puts them aside on a napkin, drinks the martini, asks for another. By the fourth Martini with two olives, the bartender asks the man "I don't mind, but I gotta ask....why do you ask for a Martini with two olives, then take the two olives out of it?" the man replies "My wife sent me to the store for a jar of olives but the store was closed."