I had a similar incident occur with me about 3 years ago. I was out shopping for Christmas present (all in the christmas spirit, BAH!) Anyhow, I going to the restroom before I start the next round of shopping. I open the door (actually push the door in as that is how it operated), when smash right into this guy. I immediately say, Sorry about that, didn't see you. His reply was something I'd rather not say here. I proceed to go on into the restroom, as I'm walking past the mirrows to the stall, I notice this knucklehead and his punk friend coming back in. The one knucklehead tells the other one, I'm gonna teach that dude a lesson. As I turn around i'm thinking (I bumped this guy by accident & said I was sorry, now I gotta fight both these 2 guys in a nasty Mall restroom, Fantastic Merry Christmas to ME!). I immeidately tell the guy to let it go, that I said I was sorry and that I didn't want trouble. This only made the situation worse, as the other guy starts laughing and calling me unfavorible names and saying this guy is a _ _ _ _ _. Enough was enough, I started to walk past them, but as I did, I was grabbed by the 1st knucklehead. Fights on. Anyhow, I had to leave that mall rather quickly as I was blooded up when I left (I'm in the personal protection business and have studied 4 martial arts for several years now). Needless to the say, the said knuckleheads got to taste what a nasty bathroom floor tasted like and well as for me, I ruined a perfectly good t-shirt and didn't get that special present from Victoria Secrets for then girlfriend.
Ho Ho Ho, merry christmas.