I had one recently. I joined "someguy" to do a two man UW run, me as the support monk, him as the 55. After much talk on what skills he wanted me to bring, (yes i was kind enough to ask him what he wanted me to bring), we went in.
Killed the first two groups of aatax's and down drops a ruby for me! Cool i thought and "someguy" congratulated me on my drop, then, BAM, i got disconnected from GW and crash to desktop, one of those "GW detected a problem, please send the info to us etc etc etc" messages.
I Quickly load up GW again and before i could PM him, he PM's me having a go saying he thought i was a @~#* etc etc etc for leaving. So i try to explain to him i didn't leave, i dropped, he replied with;
Someguy "You didn't drop, your still here"
Me "No I dopped and reconnected, i hate leavers"
Someguy "Yeah whatever n00b"
Me "No seriously I dropped, i'll even give you 1k gold"
Someguy is ignoring you
I mean, sorry, that really pi$$ed me off, as it's the first time i've been put on an ignore list!!!