All my injuries seem to be quite random, not so much embarassing, but random all the same!
I had a stress fracture, it was on my tibia (lower leg, inside of). I did not get this from running, I did not get this from jumping around like a maniac in circuit classes, I got this from doing an abs class where we had to do 'donkey kicks'. (This is where you are on all 4s: knees and hands, face down, back flat in a line limbs at right angles, you kick one leg upwards to the sky whilst maintaining balance on the other limbs). I felt something was too tight but I just kept kicking. I swapped legs and the pain/tearing feeling didn't go. That pain was too much to walk on and infact did not go away for a long while, and after many pointless and even harmful appointments I was diagnosed by a bone scan which told me I had a stress fracture all along!
I did sprain my ankle twice, both times AFTER a gym session. The first time as a result of an idiot leaving the top of a bottle cap on the stairs for a tube station. It was shoulder-to-shoulder so no one could see their feet, I slipped on the cap and my foot landed straight onto the side, ankle swelled up like a balloon and took about 2 months to heal properly by sensation and a further 2 for all the swelling to go down. A few months after that I sprained it again, walking to go to the changing rooms in the gym I saw a bin and my head and upper body were moving towards the bin to throw away the tiisues I had, my legs however had other ideas. Combine this with a ledge I'd have otherwise noticed to walk properly over...I slipped over the side and bang! Gone again!
The other injuries I have are all due to time worn joints and came on over time rather then anything else. I guess I've been lucky as in the past I've not fallen and broken anything or tripped and done something embarassing, I like this thread, its starting to make me feel a bit like I am infact coordinated (which I know is wrong because I'm always walking into things!)