Sarah in New Jersey suspects her kids of conducting a peeing contest on her Villager while she was out of town. Find out if the Car Talk Olfactory Forensics Unit can get the kids off the hook. Meanwhile, Ronnie in Florida thinks her husband's full of hot air for suggesting they'll flambe their tuchuses in a black car, Barry in Michigan thinks his Mercedes should be too fast for bugs, and did you hear the one about the parrot and the magician?