Grenade sniping

Description
Grenade Sniping is a great trick or glitch that requires precise and flawless accuracy done in Halo: Combat Evolved, Halo 2 and Halo 3. Have the Infinite Grenades option turned on, or just have fragmentation grenades in the vincinity. Then, choose a multi-player map like Longest or any other map that has an elevated area with a ledge, and climb up to the ledge. Then, keep throwing grenades everywhere continuously, or throw one to focus your mind on a single target. Multiple grenades will keep other players away from you, unless they have another long-ranged weapon. Just line up your sniping reticle below your falling grenade. It takes practice and repitition. If you succeed, the grenade will blow up in mid air.

This strategy and skill can help you in multiplayer to explode approaching grenades from a distance.