Powerful water cannon
An engineer from the Netherlands decided to create the most powerful water gun. It shoots ice bullets.
Before firing, the liquid inside is frozen by special thermoelectric cooling blocks, and to prevent the bullet from getting stuck, the correct shape is given by heating elements that slightly melt it. According to the author, he wanted to outshine all other water guns with his project and, perhaps, "overdid it a little."
Bonus. Gatling water gun from China. At least when shooting from this you won't worry about hurting someone.
