It happens infrequently enough that you don't see it coming. You walk out the door with the children, ready for an innocent outing. You open the car door and THERE IT IS. A stench, rising from the vehicle. Why? Where? How? You search frantically while the children ask you a hundred questions and give endless suggestions. Is it a sippy cup long forgotten? Maybe an abandonded bag of snacks? You check the trunk, under each seat, behind the seats, sniff things you don't even want to touch, and it's still a mystery. Am I the only one this happens to?