When your phone slips down the side of the seat, your powdered sugar donut makes the wheel all sticky, and
God Forbid, your carton of chocolate milk tumbles over into the front seat upholstery (preferably velour),
summer racing tires make driving in the rain a terror, you are in a strange city,
you know your parking meter is about to expire and your car is just around the block, but the block is like a Mobius strip -- it doesn't have another side!
(insert your own tales of Happy Eater, Péage services, Swiss road tax, bad weather, wild animal stories, etc as appropriate)