An old guy walks into the junkyard and asks, "Got any 1923 Pontiacs?"
"Doesn't matter," the counterman replies.
"Why not?" the customer asks.
"'Cause you don't own a 1923 Pontiac," the counterman answers.
"What makes you so smart as to think I don't own a 1923 Pontiac? I know what kind of car I own."
"'Cause they didn't start making Pontiacs until 1926-- that's why not."
