I have rarely been injured, and never seriously.
The first minor injury that comes to mind is the one I sustained when, on a fourth grade field trip, one of the jerks in the class "accidentally" nudged me off a seven or eight foot ledge overlooking the beach. Thankfully I landed on sand, and though it hurt like hell for a long time, it wasn't anything serious.
The only other instance that comes to mind is the time I went crabbing on the beach with my friends, using pitchforks to dig into the sand to find them, and one of my friends accidentally (this time a real accident) stuck his pitchfork into my foot. Fortunately, I did not require a tetanus shot. Bled a lot though.