This is a hack tutorial, learn how to freeze someone else's Xbox 360. First, host a party and invite your "victim". Send them a voice message about 15 seconds long an wait till you see the victim listening to the message. Kick the victim from the party and reinvite them back to the party really fast, before they stop listening to the message. This freeze has about a 75% chance of working, depending on what your "victim's" actions.