The German interjection "hä?" can mean lots of things:
- What?
- Not really!
- I couldn't hear you.
- I don't understand.
- Wait... I thought it was exactly the other way round?
- What are YOU doing here?
- How the f... is this supposed to work?
- ARE YOU F...ING KIDDING ME?!
Yeah, I know:
Makes you wanna go "HÄ?!"
Enjoy our language!