My problem is I'm temporarily living in Germany.
I try to be a good citizen and not embarass my country of origin, so I make my farts as unobtrusive as possible and never call attention to them.
However my German hosts insist on yelling out "Gute fart!" whenever I leave.
So please, help me out. Answer this one question for me.
How the heck do they know?
Topic: why are farts funny?