ever wonder how to replicate those TV show's silenced pistol that sounds like a mouse-fart? this is the plan, well not exactly a silencer... anyway this is only theoretical (for now, i need [s]guinea pigs[/s] volunteers to test this theory out) and will be, or rather, should be moved to the how-to section after confirmation if it works.
well the theory is that attaching this:

into the end barrel of the spud gun would create a mouse-fart instead of a boom, easy right?
wait, what? thats it? no no no, i'm just getting started.
since the whole whistle is occupying the end barrel and blocking the barrel itself, it wouldn't be a cannon anymore right? so lets do a diverting design!

simple as hell right? how the diversion happens is that when the projectile passes away from the diversion hole and while the projectile is blocking the main exit(aka the end of the barrel), some of the gas's pressure would go through the diversion hole.
wait, what? it looks stupid? yes it does! obviously it looks stupid. well then let me introduce the real deal.
first of lets introduce the "fipple"

this will be our core to the mouse-fart silencer... well kinda-silencer, because of this, the redirected airstream would create a high pitch whine upon going through the fipple.
**further explanation of the fipple and a how to make one, actually its a how to make a flute...
http://en.wikipedia.org/wiki/Fipple
http://www.ggwhistles.com/howto/
and heres the complete design:

adjusting and tweaking the design will change the tune, no specific measurements to be provided because i'm not sure myself
