The Daily Mail seeks to sensationalise a non-story.
Acorns are falling onto a footpath used by hospital patients, and one person injured an ankle when stepping on one. The hospital wants to avoid the possibility of someone jumping on the compensation bandwagon, so it has taken what seems to me to be a very sensible step:-
‘Our groundsmen now sweep acorns up and they have put the signs up just to be on the safe side.’
The lunacy isn't in the warning, it's in the heads of the people in our society who see a potential compensation claim in every poor finger. The Mail knows this, but it knows its readership - there's more mileage in poking fun at a hospital's health and safety policy.