Ever had this happen? (pics)

I had something similar happen to me when the plastic gear at the bottom of my distributor wore out. Was cranking the motor trying to re-start it and the gear caught enough to turn - must have sent a spark out to a cylinder that had the exhaust port open - with all that vaporized gas in it and BAM! Felt the car lift off the ground!! Probably felt the car move more than it really did though. Replaced the distrubutor with one that had a better gear on it! Those were the days...