Cop Stop Conundrum
RAY: Here's the answer. What the cop saw as soon as the fellow opened the door, was the little sticker that gas stations often affix to either the door or the door pillar that says, your next oil change is due in three months, and they put the date on it. And it gave him away.
TOM: Because it was three months ago.
RAY: Yeah, he'd had an oil change three months ago and if this is the first time he's driven the car, he's in deep trouble.
[ Car Talk Puzzler ]