My brother made this PVC pipe air cannon that runs off of 40 psi. The paint grenade is home-made and is covered in wax paper to ensure that it hits the destination without exploding in air.
This is a part of the Red VS Blue series. It doen't belong to me. I just cut this great part out for people to enjoy.
PS, for those slower people out there, this was made using "Halo 1" by the geniuses at RoosterTeeth.
My turtle did this one morning before school. I had shown a friend and he told me to put it on the internet. It's not long or even very pretty, but enjoy my turtle's never ending entertainment...