Earlier this morning was going upstairs and looked out of the little staircase window to see another car parked on my drive along side my car. The street was clear so not as if there was a parking problem.
Went out of the front door to see who it was/what was he doing there and he looked up, startled/bit shocked maybe, started up his car and took off in reverse, presumably back down the street from whence he came.
Never seen before or since!