Parachute Glitch

Reintroduced in the second DLC content pack for GTA IV, The Ballad of Gay Tony features the ability to use parachutes, allowing the player to base jump from buildings and helicopters in safety.

However, the nature of the parachute's turning system makes it possible for the player to actually achieve vertical lift, suspending their glide for an indefinite amount of time.

Walkthrough

This glitch can be exploited from any height, as long as the player has the parachute active.

Pull back with the left thumb-stick, putting the player in the 'slow fall' position, then, rhythmically press the left and right triggers together. At a certain rate, the player begins to stop falling and start going up.

With sufficient altitude, it's possible to reach incredible heights, even leaving the game's skybox. However, if the button to turn is pressed too rapidly, the parachute will break, ensuring certain death, unless above water.