As daft as this sounds it is true. At the tender age of seventeen I had a Vespa PX200E. In those days scooters had the clutch/gears on the left handlebar. I agreed to deliver a few papers for my idle younger brother and pulled up outside the houses. I switched the ignition off and put the bike on its main stand. When I returned to the bike I switched the ignition on and standing next to the bike I kick started it. To my utter horror the feckin' thing fired up and jumped off the stand and ran riderless down the road. To make things worse it hit the only parked vehicle on the road, an old mini van. I'll never forget the look on the van owners face when he ran out of his house. He looked down at the bright orange scooter lying on it's side revving away merrily. The astonished look on his face when he clapped eyes on me standing about a hundred yards down the road was priceless. :rolleyes
Never underestimate the ingenuity of an idiot!