Get on some SA multiplayer with your friend, get yourself two hydras and soar into the sky. One guy goes really high, then bails out of his plane and the other guy trys to catch him below (A long way down, don't lame it and NO hovering ;P) Invincibility is allowed, or you can use a parachute I guess. Good luck to anyone that feels like trying
(The falling guy should fraps the thing since there's no replays :E)