One of the best pieces of lore at my employer came courtesy of our "free food" slack channel. It was customary, after catered meetings, to post the location of any leftovers so the vultures could come by and enjoy a free second lunch.
Until.
Until the "cool intern" noticed food outside a conference room shortly after noon and posted it on the free food channel. Hordes of people came by to avail themselves of the food, leaving a horrified meeting organizer to fight them off while trying to post a rebuttal on slack saying that the food was NOT, in fact, available for the taking, the attendees hadn't had a lunch break yet, pleading with people to stop taking their food, etc.