After eight hours of fishing and with dark closing in I pulled up to the dock, tied the boat up and proceeded to get the truck. I had a buddy with me for the first time and while he does not own a boat he (I thought) was relatively experienced on boats. While I was backing down the ramp he decided to load the boat on himself... The lesson I learned is this- Never let anybody even think about touching the controls of your boat unless they are prepared to buy it. The damage he caused was only to the trolling motor and transducer, but it could have been much worse and believe me it is a very uncomfortable situation. I learned that it's important to tell your guests "hey this is my boat, if I want help I'll ask." I'm curious how all of you handle situations like this with voluntary helpers. I really don't ever want this situation to come up again but also don't want to be a jerk to my guests or I'll be fishing alone...