At a previous job, we had a "pipi" mailing list (pee, in French), where people would send "I went to pee" from unlocked computers. The "victim" themselves would

At a previous job, we had a "pipi" mailing list (pee, in French), where people would send "I went to pee" from unlocked computers. The "victim" themselves would often be members of said mailing list. That worked quite well, so organically, the list ended up being used mainly for random jokes, news and stuff, rather than the "I went to pee" messages.