What does it mean when Germans say “einen Vogel haben”?

The German expression einen Vogel haben (literally “to have a bird”) is used to describe a person who is acting crazy.

Du hast doch wohl einen Vogel! You must be insane!

History of the Phrase

Possible etymological (word history) theories of where this expression comes from are interesting and sometimes hilarious.

Most likely people are accused of “having a bird” because of an old belief (or urban legend) that crazy people have little birds living in their heads. In Germany, it is very rude to stab the side of one’s forehead with one’s index finger while looking at someone else, thus “showing them the bird” (jemandem einen Vogel zeigen) and accusing them of being crazy. Don’t confuse it with English “flipping the bird” (the middle finger) - and don’t do it to another driver: in Germany, it can get you fined for insulting someone.