The possibilities are endless with the Mountain Climber Hack, but here is something i had fun with.
Horde perspective:
When you are ported to warsong, turn around and look to your right. You should see 2 small pots. With Mountain climber active, run against that wall, and go to the platform on the right. You can now exit and run across the feild. Take the alliance tunnel, then the roof, and drop down. Now you are in the enemy base before the game even started i'm sure it is possible to do with alliance somehow, just never tried.
USE WISELY, AS IMPROPER USE WILL GET YOU BANNED!!!
*although i have never been banned/GM contacted for it
I can make a video tomorrow if anyone needs