this has been floating around in the internet for ages already
it's not exactly a taser.. more a cattleprod...
now.. THIS is a taser 
The Taser Cannon can direct a 15,000 Ampere plasma channel through
the air along a straight trajectory, at grounded targets up to 35
ft downrange.
The cannon consists of 30 high pressure pneumatic dart stations,
each capable of launching a tapered aluminum sabot that trails a
thin 'seed wire' 0.008 inches in diameter.
Cannon tilt and pan is pneumatic, and a sighting laser is located
inside the cannon head. When a launched sabot contacts the target,
the Marx-configured capacitor bank automatically fires and erects
the bank to 110,000 volts, igniting a plasma channel along the
vaporized seed wire. The plasma channel quickly intensifies,
magnetically confined in the air by the Lorentz forces of its own
current.
Damage to the target can vary widely. Most spectators experience
some degree of sinus discomfort after several firings, due to the
high brissance of the plasma explosion.
The capacitor bank is currently disassembled, and newer capacitors
are being added to increase the bank energy to 250 kilojoules, and
the range to 50 feet.
