A friend of mine was recently complaining about someone who e-mailed a large distribution list and the two people who hit reply-all.
Reminded me of the early days of e-mail back in the 1990's when such things could last for days and span hundreds of e-mail, when there were mysterious lists that had hundreds of people, and someone would hit reply-all, and and then someone else would hit reply all to tell people not to hit reply-all, and then people would hit reply all to that to lament about the irony, and then lots of people would start hitting reply all out of annoyance to tell people to shut up, and then people would hit reply all to just be part of this weird social phenomenon.
Ah, good times. I haven't seen that in a long time. Always interesting how society interacts with a new technology.