Speaking of funny signs at work - I work in a large office where everyone on our floor shares a fridge to put our lunches.
Well - apparently someone ate someone else's lunch, so that person put a huge (mean) note on the fridge telling whoever ate his lunch to get their own and quit eatting other people's.
Later that day - someone wrote "But I was hungry!" on a sticky note and stuck it next to the first note.
When I was travelling through Greece a few years ago, there was a sign in the widnow of a dry cleaners that said "Ladies drop your pants here and spend the rest of the day having a good time" All I can say is that I've definately been going to the wrong dry cleaners!
One of my favourites, is the old Pepsi alive campaigne. When they translated it into chinese it was translated as Pepsi brings your anscestors back from the dead.