I was riding my wheeler down the side walk and I was towing a couple friends on thier skate boards once I hit 2nd gear mike decided to let go, but mark was still hangin on, so I decided to nail the throttle, thinking mark would just let go. Once I was almost maxed out in 3rd i looked back and saw Mark hanging onto the grab bar and him being dragged along the sidewalk lol. Of course I instantly hit the brakes. He was ok but had some road rash. I dragged him for bout 60 feet at about 25-30 mph. All this was at about 10 at night, and there was this one guy a ways down the sidewalk that was givin us some bad looks. It was cool though.