My College had a huge Student Exchange program going with some College In Japan. All the Japanese kids would hangout in this lounge area in my Dorms literally, all night. It was right next to the 24 hour, you're drunk sammich place.
One night I saw like a group of 8 of them leaving there and I said "konichiwa!" because I was intoxicated and feeling social, her rebuttal was "I'm Korean asshole"
To this day I can't tell if she was insanely hot for being a smartass, or if I was accidentally racist.