At work, our email system has lists, as yours probably does. You can send to "All", or employees of this or that daughter company of the parent, or this or that department, or the people involved with this or that project, etc etc.

So WHY is it that when people want to send a general announcment (usually something stupid like "Who took my lunch from the 6th floor fridge?") they send it to the All list, and THEN to EVERY OTHER LIST!?!?! Wouldn't it make sense to assume that the All list sends to ALL employees? Every morning I've got hundreds of emails waiting, but it's usually just a couple of messages sent to every list that I'm a member of. I HATE that!