I watched a guy try to knock down a dock in Huntington Harbour this weekend. Full throttle reverse into a piling with the transom. The boat was an old Mag fishing boat (around 30 feet). So all it did to the boat was take the swim platform and livewell off the back. The dock looked pretty sore though!
I think that one with the ski boat on top of the house boat happened at my home lake, Lake Perry, KS. A lady died in that accident. It was just terrible. Happened at night.