Operator of vessel 1 stated he was cruising around 20 MPH and looked down to retrieve some string cheese from cooler then looked up, heard a scream and throttled back.  Vessel 1 rode over the stern and stopped and rested on top of vessel 2.  Operator of vessel 2 was ejected from the vessel and the other occupants of vessel 2 ducked and stayed on board the vessel.  The occupants on vessel 2 pushed vessel 1 into the water and vessel 1 towed vessel 2 back to shore.
West Yellowstone