Teleporter Launching Glitch
From Halopedia, the Halo wiki
The Teleporter Launching Glitch is a glitch that can be performed in Halo: Reach. This glitch makes the player launch out of a teleporter at an extremely high speed.
There is a variation of the teleporter launching glitch with two way nodes.
This glitch happens because of Halo: Reach's camera/player position system. When holding onto something in edit mode, the game sets the player's position based on available space, depending on the positioning of walls, ceilings and other objects. When you enter the teleporter with the object you hold, there is a split second where the item makes contact with you before the player is positioned properly. Upon turning into player mode, contact with the object launches the player across the map. This is similar to Equipment Jumping with the Deployable Cover. In edit mode, the monitor will not be launched as it automatically positions itself from the object.