Examples that Danish is the most confusing language for English speakers:

In Denmark, when washing machines are done, their displays write, "Slut!", which means "Finished".

When someone enters an elevator, the display changes to "I fart", which means "On the move".

Tourists have difficulty finding a nice WC, because the signs often say "Bad toilet", meaning "Bathroom and toilet".

In lobbies with multiple elevators, one sign may say, "Gods elevator", which means "Freight elevator".

#offtopic

@randahl ... and of course the always hilarious signs on the high street for the final sale - Slut Spurt!
@rhempel nowadays were have the opposite problem, as window signs will often say "Sale!", which is confusing to Danes, as that means "Halls!", as if there is some big rooms inside the building.
@randahl @rhempel in French, "sale" means dirty (feminine), but it can be used as short for "dirty whore".