The normal stuff that would drive people crazy doesn't apply to me. I live in China and I'm not bad at the language, so it riles me up when people assume I don't understand. Imagine the beginning of Rush Hour where Chris Tucker blabs at Jacky Chan, that shit happens here from time to time, except with some role reversal.
People say some really weird shit, a recent example being when a friend and I were buying booze and smokes in a nearby convenience store, it went something like this. "Fucking foreigners, looks at these two, look Russian, don't trust those bastards". This dude was stood right next to me, I turned around and asked him if his mother taught him to be so fucking rude and did he want a kicking from an Brit and an Ozzie. He left quickly with a red face.
On a lighter note, I could only roll my eyes when at the end of watching Missions Impossible 2 in the cinema way back when, some guy stood up and said "that was totally unbelievable", my chuckle at his immense wit stopped when his friend responded in kind and they started in all sincerity discussing how 'impossible' the movie was.