My best friend bought a new to him sea doo speedster. Well he unhooked the back tie downs and put in the plug. As I was loading the cooler in the boat. He got behind the wheel while I unhooked the front tie strap. I backed the sea doo down the ramp into the lake and tap the brake and the boat didnt float off and away. He starts up the twin engine and shifts it into rev and gas on it and boat didn’t move. He said are you sure you unhooked the front strap. I said yes as I was walking back there to double check. I had forgotten to unhook the safety chain. But I had never owned a boat with a safety chain. My buddy laughed and told everyone what I had done. All my friends are new to boating and it made there day to hear about my screw up.