A man enrolls in the army. He is going to the supply center to gather supplies. The old man at the supply center says, "Sorry, we're out of guns and knives. Instead, when you want to shoot a gun, just hold out your hands and say 'Bangity Bang'. If you want to use a knife move you hand forward and say 'Stabbity Stab'.
The man goes out to war with no weapons. In the thick of battle he decides to follow the old man's advise. He extends his arms and says, "Bangity Bang." The soldier fell dead. Another enemy soldier came up from behind him. He stuck his hand out and said, "Stabbity Stab." He, also, falls dead.
Now the recruit with no weapons is killing everyone. No one can touch him. Then he sees a man who is killing all of his comrades. He extends his army and says, "Bangity Bang." Nothing happens. He shoves his arm at the guy and says, "Stabbity Stab." Nothing happens. One second later the man with no weapons dies. The enemy soldier, while circumrotating his arms, says, "Tankity Tank."