Halo 2 Easter Egg - Blue Screen of Death

In the multi player level "Zanzibar", you can see the Blue Screen of Death after you open the main gate.

On the upper level of the castle side, the computer that opens the gate will be usable. When you walk toward it, it will say "press x to open the gate", after you activate it, the gate opens and the computer screen will turn into the Blue Screen of Death.