Have you ever hit "reply all" on a work email by mistake? I'm always extra careful to make sure I don't because I'd hate to be that co-worker (you know the one). Usually when Reply Allers overshare, people just grumble about it under their breath, but once someone wrote back "you go, girl!" when this notorious offender copied the whole company to say she'd submitted her expense report. It was super funny... and effective! It stopped the reply-all epidemic for a good few weeks after that.