You'd be surprised how stupid people are these day's, it makes sense to have even the lamest precautions on your product.
Here in Australia I heard about some clown who sued the Local council and got some stupid amount of money because he fell out of a tree and there weren't any "Please do no climb tree's" signs.
Retard.
EDIT: haha rammdstein, that reminds me of another story from down here.
Some clown broke into someones house via the roof, fair enough, that seems like a logical way to do it. So this guy crawled around the roofing till he found a manhole, he lifted the manhole up, started to climb down and oh no, fell down and broke his leg.
6 Weeks later he sued the old lady for X amount of dollars succesfully under a slip and fall claim.
