[BoppreH]

Once upon a time we were pranking each other in the university lab. We thought ourselves pretty clever by convincing a friend to run a Fork Bomb.

"What is it supposed to do? Nothing's happening."

"Really? Did you run it in a shell?"

"Yeah, in my SSH session in the main server."

Oh.

The server was down for a couple of days while the admin figured out what happened, fixed it, and limited the number of open processes per user.