I hit myself hard

On Saturday I thwacked my left middle and ring finger hard against the inside of my right arm. It really really hurt. My right arm stung for a day. My left fingers still hurt. Hitting myself is a pretty common occurence with my movement disorder, but usually my injuries don't last this long. Please help me feel a bit better. Not schadefreude, but let me know I'm not alone. Please tell me the most interesting or worst way you've injured yourself accidentally. Extra points if other objects were not involved.