RedactedNarrative: Vessel 1 operator stated he had been operating the boat and pulled the boat along the starboard side to the DEC Launch in Skaneateles. Operator advised that he exited the boat and walked up to the parking lot to retrieve his truck and trailer leaving his two passengers in the boat. While operator was gone the boat drifted away from the dock, as it was drifting one of the passengers started the boat and meant to "hit the brake", but pushed the throttle forward causing the boat to strike the dock and proceed onto the dock.