In a similar vein, I had a case of internet mistaken identity once that gave me some serious raised eyebrow-action. I saved it on my LJ for posterity, but it was about five or six years ago now - when I was still using AIM. It was with some woman I hardly knew. I had her on my Buddylist as I'd talked to her like once, almost a year prior. So I was watching TV and IMing a couple friends when a new IM window popped up on my screen:
HER: WHY hasn't anyone KILLED YOUR ASS!!!
ME: excuse me?
HER: YES!!!
ME: umm, no habla crazy talk
HER: Because you troll Transsexual chat rooms
HER: Yes you do bizzitch
ME: look, what the hell are you talking about!?!
HER: You know what I'm talking about
HER: Busted you there a while back!!!
HER: You swore you were straight
HER: caught you red haded
HER: handed*
ME: look, I dont know if this is your idea of a joke, but I barely know who you are! I think I talked to you once, like months ago, and that was about a convo from a messageboard we both visited
HER: which message board ?
ME: umm, [board name redacted]?
ME: this is [username redacted], right?
HER: Oh f**k!!! You have the same handle as another guy that I was chatting with !!
HER: F**K!!!
HER: Some guy by the name of [username redacted]
HER: s**t!!!
HER: I thought you were him
ME: yeah, umm, no
ME: sorry to disappoint
HER: I just saw the SN difference
HER: I got you two confused
ME: sure, np, completely understandable
ME: happens all the time
HER: I'm going to delete you from my list, no offense because I have a BIG bone to pick with him
ME: noooooooooooooot a problem. hope you two work it out
ME: bye
So, yeah. That happened. In hindsight, the thing I got the biggest kick out of was she took the time out from her diatribe to correct her own spelling.