No Weapon

The No Weapon Glitch can be done in both Halo 2 and Halo 3. It is a good tool for Machinima as, it makes you drop the weapon that you have, and if you don't have a secondary weapon, you will have no weapon.

Halo 2

 * 1) The game type must be set to an objective type, such as Oddball, Capture The Flag, or an Assault game.
 * 2) You can have only one weapon and that is a Plasma Pistol, no secondary weapon.
 * 3) Charge up the Plasma Pistol and walk up to the Oddball, Flag, or Bomb.
 * 4) Pick up the Objective item while keeping the Plasma Pistol charged.
 * 5) Drop the Objective item quickly and you should be holding no weapon.

Halo 3

 * 1) Start a Forge game with at least two players.
 * 2) Have one player enter Monitor mode and spawn a weapon.
 * 3) Have player two pick the weapon up, and at the same time, have player one delete it.

Note: You must be very quick when doing this.

Note: Even though your weapon is gone you're still in a combat pose, you can lower your weapon but the game will still think you have a weapon so you will look like you have an invisible weapon. For this reason machinima makers that want realism should use an Energy Sword.

Alternative
Go to Bungie.Net and download a variant called "Flamethrowers". Then play it and you start out with a Flamethrower. If you drop the Flamethrower, then you have no weapon. This does not work on maps like Last Resort, where you can't forge a Flamethrower.