Jet Pack Bungee glitch
From Worms Knowledge Base
This glitch allows you to attach the Bungee in mid-air. In order to perform the glitch, you will need a Jet Pack and Bungee. Equip the jetpack and select the bungee as the secondary weapon. Then, hold down the right and up arrow keys, and press spacebar. The worm will unequip the jetpack and automatically equip the bungee, which will be suspended in mid-air. The bungee rope requires that the worm must be a certain height above land before it will deploy, and the same rule applies in this case also.
This glitch can be of limited use for the player executing it. However, it can be argued that this will allow a player to survive a potentially fatal fall if executed just before the jet pack runs out of fuel, and similarly can allow the worm to gain extra distance by building up momentum on the bungee.
The cause of this glitch is currently unknown.