German.

I went to Berlin a while ago and I actually hated it there.
People often do sound angy and annoyed mostly because they ARE.

People are abrupt, barely talk, refuse to speak English and look weirdly at you for not speaking German.
Waiters barely look at you serving your food or talk (This happened at least 5 times) except for a single italian restaurant.
In a supermarket there was an older man who had trouble focusing on paying with coins and the man behind
the counter kept screaming (Yes screaming) and pounding on the counter saying BEZAHLEN! BEZAHLEN!

I don't know what's going on over there but nobody seems to be happy.

:T Berlin was always my least favorite place to go. I like going into the southern city-states more. Much more lively and happier people.