You sure can find some interesting things filed with the US Patent office.  For example, this gas powered missile launcher.  Seriously - read on.

"A toy gas-fired missile and launcher assembly whose missile is composed of a soft head and a tail extending therefrom formed by a piston. The piston is telescoped into the barrel of a launcher having a closed end on which is mounted an electrically-activated ignitor, the air space between the end of the piston and the closed end of the barrel defining a combustion chamber. Joined to the barrel and communicating with the chamber therein is a gas intake tube having a normally-closed inlet valve. To operate the assembly, the operator places the inlet tube with its valve open adjacent his anal region from which a colonic gas is discharged. The piston is then withdrawn to a degree producing a negative pressure to inhale the gas into the combustion chamber to intermix with the air therein to create a combustible mixture. The ignitor is then activated to explode the mixture in the chamber and fire the missile into space."

Don't even try to look at the pictures.  They will confuse you.