knife related - all those times i cut towards a part of my body and slipped. I still do it with screwdrivers into my hand. Ouch.
The bicycle - just finished fixing the front wheel on my 27 inch racer when I was 15 and running late for kayak lessons. Rode for about 4 miles and finally down a steep winding hill to the lake where the classes were held and saw everyone setting up. They all looked over to me and so I showed off by doing a wheel stand. The front wheel fell off. My face bit the tar, broke my nose, my cheekbone, knocked out two teeth, split top and bottom lips and rubbed half my face off. The kayak instructor took me to hospital. Now 20 years later one of my front teeth is dead and i had my fat lip fixed. Love motorcycles.