First play on multi-player, then on the level called The Wrong Train (first level) as soon as your going to the part when you ride your horses have your partner kill you, then look at your partners screen and you will be able to see your horse floating a little bit and it's legs won't be moving, and Jericho will be sitting down in mid-air flying, but you will not be able to shoot. This glitch will run out when you die