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
As an arthouse cinema projectionist I learned that Danish and Swedish films end with an insult. I don't think they're calling the whole audience sluts, just that one person in row three.
@rayotron @randahl The Russians do that too. Their films end with Finnish word “koheli” (= madman, crazy person).