Note: The following weapons are required: a plasma grenade, fragmentation grenade, and a rocket in a rocket launcher. Go to a level that supports vehicles. When first attempting this, back a Warthog up to a wall. Get on top of the Warthog's gun (not manning it). Look at the ground in front of the Warthog. Throw the plasma grenade in front of the Warthog. Immediately throw the fragmentation grenade directly on the plasma grenade. After that, quickly shoot the two grenades with the rocket launcher. You may be hurt in the process. However, you will be propelled high into the air if done correctly. Note: You can use this trick to get on top of the cliffs in Blood Gulch.