Hi   Wife was driving car Saturday and parked up in a carpark in town on a slight slope. She got out the car locked it and went off to the shop.  About 10 mins later someone comes in and asked who has the Yeti - because its rolled across the car park and into another car.   On inspection both my wife and the other party agreed the handbrake was in the on position and there was no obvious reason for it to roll.   1 poss esplaination is that it was not on tight enough but we have had the car