Joke of the day

This guy goes into a grocery store, picks up some donuts, beer, a box of macaroni & cheese, and a can of tuna. He walks up to the checkout counter and puts his purchases on the belt. The cashier scans his groceries, looks up at him, smiles, and goes, "I bet you're single, aren't you?" The guy laughs a little, and says, "Yeah, how'd you know?" The cashier says, "'Cause you're ugly."