I’m Sorry — I Seemed to Have Misplaced My Car. In Your Pool.
This actually happened to me, twice, though my car didn’t land in a pool either time. Once, I’d forgotten to put on the parking brake, and my car managed to squeeze out of a parallel parking spot, on its own, and crash into a car across the street.
The other time, however, I had gone to pick up my girlfriend for a date. When she answered the door, she said, “Is that your car rolling down the street?” I chased it for about a block, before a man started yelling at me to “Let it go, son. Just let it go.” I did. It sideswiped a boat and landed softly in a pile of mud. Ta da!
Use the parking brake, people! That’s what it’s for.