Don't shoot or aim at people or animals, the bullet really has a high velocity, and it will hurt a lot!
Always wear eye protection when firing the spud gun.
I am not responsible for any accidents.
Step 1: How it works
The spark generates heat, which ignites the fumes of the deodorant that you've sprayed in there. The igniting fumes will make the gas expand and build up pressure inside the combustion chamber. When there is a higher pressure at the inside than at the outside, the 'air' from the inside wants to get to the outside. There's only one way to go, and that's trough the tube.
The tube is blocked by our BB bullet, so it will get pushed out of the tube at a high velocity.