Move the banana to the desired position (preferably somewhere in the air) and press space. You can press space again and again, but do not spam it, as you will lag to hell. Press the flag to reset.
The "Banana Bomb" from the game Worms™ is a weapon that immediately activates once it hits something, upon which it explodes into more exploding bananas. The entire iPhone game is filled with strange weapons, such as Concrete Donkeys and Super Sheep.
