This happened to us several years ago, a basic reply-all storm across probably 30k employees. The icing on the cake though - when the storm finally calmed down

This happened to us several years ago, a basic reply-all storm across probably 30k employees. The icing on the cake though - when the storm finally calmed down a few hours later, the original sender then tried to recall the message. The recall notification went out to everyone and sparked it back up again.