What are some further examples of sharp edges?

[a guest]

What are some further examples of sharp edges that would not be obvious?

[Michael]

Broken glass any place… on the ground, in a window sill, etc

Nails or screws sticking out of something like a fence or wall

Any sharp edge on metal, especially any sheet metal that your maintenance people may have cut to patch or cover something

Broken off rusted metal fence post sticking out of the ground just enough to step on.

See http://reacguru.com/upcs/h&s/index.htm#Sharp