Germans often end their sentences with "nä" and they don't know it, I first recognized it as a foreign friend mention it, and now I have stopped, but it freaks me out because I can't overhear it anymore when my friends do this lol. (Don't know how to write "nä" in british, just type it in google translate (with german as language) and click on the sound button lol)
Edit: Fail! I should'nt post at night.. thats not a stereotype : / sorry ><