Umm here's mine.
Brief synopsis: Random party doing chest-runs outside of Imperial Sanctum. This one guy dies, I happened to be running by so I decided to find a safe spot to "rebirth" the guy, then without even a thank-you, he just spazzes at me

red dot = the guy
pink dot = other people in party (they didn't say much, infact they had their own little convo.)
blue dot = a friend of mine
white dot = me
http://img159.imageshack.us/my.php?image=g1vg9.png
Above^ - Ok, so he "says" he was lagging which I don't buy, it still doesn't justify his donkey-like behaviour. The last part where I censor out some of what I've said is pretty much "STFU" and "F"
And this was his attempt to further annoy me after he left the party (this is in a different run)
http://img133.imageshack.us/my.php?image=g2ww1.png
My favourite part is where he threatens me... trying to act all "gangster" on a game. I find that hilarious, I don't understand why peopole do that on games... especially Guild Wars where actual Player to Player harassment is pretty minimal. It's not like his Guild can follow me around Cantha/Tyria and KS/PK me. All they can really do is spam me with annoying msgs and even that can be countered with the nice little "ignore" feature.
I know this is stupid but this is the only time where I was "mad" enough to take screen-shots of. The level of stupidity was way beyond my level of comprehension.
Oh crap, I just realized I forgot to blob out one part >_> sorry.