Requirements:
-A Friend/Victim
-Level 50 in Combat training

Steps:
1)Invite your friend/victim to a player match and Xbox Live Party
2)Tell him to go to his PlaryerCard>Leaderboards>S&D
3)Tell him to hit Y to change filter
4)You change the Lobby to Combat Training
5)Tell your victim to open up the xbox live party and click on your profile then view CoD PlayerCard
6)Tell him to keep pressing B until he gets to his PlayerCard and go down to Prestige Mode
7)Tell him to go through all of the steps EXCEPT "ENTER PRESTIGE"
8)Change to Player Match and tell him to Enter Prestige
9)Laugh as your victim cries! :mrgreen:

Glitch isn't new just thought i'd post it if you wanted to make some of your mates rage. mates
Unfortunately, I found this out the hard way trying to prestige in Combat Training.