Make a powerful squirt gun in a few seconds for dirt cheap.
Step 1: Materials
All you need is a tack and a can of sparkling water. This won't get sticky.
Step 2: Ready, Aim, Fire!
Before you activate your totally awesome water gun, find a victim. Sneak up on them with the unopened can in one hand and the tack in the other. Once you have a good shot, poke a hole in the can with your tack and aim it at them! Make sure to watch your back after that! Did it lose air pressure? Just squeeze the can.
Feel free to comment! Vote for this in the unusual uses challenge! Thanks!