Gameplay

Jack o' lantern

From Halopedia, the Halo wiki

The Jack O' Lantern underneath the tank's turret section.

The Jack O' Lantern is an Easter egg in Halo 2. It is simple to view, as you simply need to destroy a Scorpion, and stand on either the upturned turret or the main body of the Scorpion. Look at the gears on the connecting section, and there is a Jack O' Lantern drawn in blood. It may help to turn on your flashlight.