Stargate: Atlantis Easter Egg - Fork Bomb

In Season 5, Episode 16: Brain Storm, at the scene where all the physicists are discussing the theories in the white boards, look at bottom right of the last white board that is showed, it says:

Fork Bomb
:(){:|:&};:

In UNIX systems ":(){:|:&};:" is a command that creates a infinite amount of process, crashing the system (called a Fork Bomb).