These look interesting 

Airzooka is a hand held fun gun that fires a ball of air up to 30
feet. Laugh with amusement as, seemingly from nowhere, you are able
to mess up a person's hair, ruffle their shirt, dress, or papers
from a desk from a distance, or just plain blow 'em away!.

I want one of these to shoot at those IMF idiots and dirty their
expensive corporate suits 
Splatmatic Magnum Splat Paintball Shooter requires no batteries or
C02. Shoots flying color .50 caliber, non-toxic, biodegradable,
water-soluble paintballs. If you want twice the fun of the Pistol
Splat, go for the Magnum Splat! The unique dual-feed system, the
Magnum Splat holds two times the ammo for two times the fun. Youll
have non-stop action while the other guys will be reloading again
and again!

Yet another reason to love SpongeBob
Get ready for the next generation of miniature water excitement
with the SpongeBob Squirtz keychain! Fill it up and squirt dozens
of shots of water over 20 feet! The portable size is perfect for
surprising your enemy with a squirt during a covert mission, or
startling your friends with a wet spurt when they least expect it.
Its totally awesome water action!
http://www.coolgadget.net/index.html