Hooligans in Hamburg, Germany managed to sneak into a train depot and decommission a vehicle by barricading one of its doors with bricks and sealing it with expanding foam. Stupid and funny as it may be, the damages are in the thousands of dollars.
Don the collie hopped in the tractor in Abington, South Lanarkshire early in the morning, crashing through a fence and careening through a busy commuter road. Don's owner was eventually able to commandeer the vehicle, and luckily no one was hurt.
And really, could you be mad at the little guy with a face like that?