I'm forever tripping over things and catching my arms on doorhandles and the like, but this one was a doozy! A couple of months ago I was walking back into a car park where I'd left my car. The whole thing is surrounded by a silly little fence that's maybe 10 inches tall, so I went to step over it rather than walking all the way around to the entrance. Of course, clumsy disaster area I am, I caught my toe on it and went flying, landing with my full weight on my left arm!
I got back to work and took my jacket off, and saw my left forearm was swollen up like a balloon! A coworker made me go to hospital in case it was broken, and I got it checked out. Luckily it wasn't broken, just very, very bruised and swollen! I have photos somewhere, they're gross. Took ages to go down...