This nice exploit is for Warsong Gulch battleground in WoW.
As a horde member, run out the main gate, and turn a quick 180. On the left side of the main gate there is a little pocket you can jump through, right next to the Steel that wraps around the gate’s arch. You can see the exact spot on the included screenshot.
This exploit usefulness can be used to hide the flag if necessary or provide a sentry like positio since you can see through the walls.