Few weeks ago I was in a flex raid and there was some guy on ventrilo who sounded exactly like Leo of That 70's Show (http://www.youtube.com/watch?v=RDE_Qn2zihA). Initially his voice was funny to me but he was actually very annoying.
I'm still not sure if he was stoned or was just trolling us.
Anyway, I don't really care what other people do behind their PC as long as it doesn't bother me or others.