what happened at work once, was that this idiot user had some problem with a legacy application. didn't know what to do, so he sent a mail asking for help. but he sent the mail to two groups that include that about everybody. including the say the equivalent of the ceo and all the higher ups. the idiot didn't check. now what happened, is that people started doing a reply to all. (this forum would include, say 4000 people?)
people keep telling them to stop (using reply to all). it eventually stopped but the only thing i can say is thank god for shift delete...