If you are to carry heavy things, make you get a firm grip, and that you get a firm grip on something which won't get loose.
When I was 17, and working in the warehouse of a transport company, I was asked to move a big piece of steel pipe. It weighed about 70 kgs, and as I am a fairly big guy, I grabbed it's handles, lift it up properly, and started to walk.
Three seconds later, one of the welded-on handles came loose, and I dropped the pipe on my right foot. As I didn't wear any steel-capped shoes the pipe smacked the big toe with ease.
I still can't bend that toe without using a hand for help; the "whatever-they-are-called", that makes the toe move, musta snapped.
"Baah! I don't need no frigging doctor! I need some bloody steel-capped shoes!" (I got them the nex day. :-))
I have also noticed that it can be very painful to step on rusty nails...
