The Porridge Gun has appeared in the short film A Close Shave where it shoots blasts of porridge at Wallace because Shaun had chewed through the wires. Wallace tests it in the house then again blasting soap at the clock. Gromit later uses the porridge gun to shoot it at Preston's van and at him.
It later reappeared in Project Zoo as one of the weapons Wallace invents for Gromit to use.
The Porridge Gun is one of Wallace's inventions which appears in A Close Shave and later, in minigun form, in Project Zoo. In the latter it is used to malfunction machinery, while in the former its primary purpose the rapid deployment of porridge at the breakfast table.