[truculent]

A favourite of mine is the London Underground having warnings about using the escalators, stating that last year there were 100 incidents from people not being sufficiently careful.

Given the number of people using the service, this is incredibly small and I hardly think a sign is going to help the few people at risk!

[potato3732842]

The thing that really peeves me about those signs is that pretty much all the accidents involve women with fashionably loose clothing. While I'm sure a few guys got scalped by their dreadlocks it's worth directing the warning at people most likely to need it and therefore most likely to benefit from it same as you would if it were screening for a particular disease.

[dcminter]

Not to mention the enjoyably ambiguous "Dogs must be carried" !