Excellent tip there. I learned the hard way several times. One exactly the same as yourself, dropped an IBM keyboard directly on to my foot and had trouble walking for the next week or so.

Other time was a upward impact from a soccer ball I tried to catch. Bent back all 4 of my fingers, one thumb on my right hand, causing me to lose all motion in that hand for a week while it returned to normal.

Electrical wise, I too have been charged with the voltage from an electrical outlet. I'm guessing 240v because it's an Australian home. I think my actions were best, place one hand behind my back and don't touch anything. If I did, the voltage would most likely have charged through the heart and killed me on the spot.

Not a nice thought, but something we face every day when working on technology. :/