DISCLAIMER: BY READING THIS, YOU ACKNOWLEDGE THAT YOU CANNOT HOLD ME RESPONSIBLE FOR COMPUTERS OR WORLDS BROKEN BY THE FOLLOWING.
Want to make your world lag? Want to listen to the tune of "Can you feel the lag tonight?" Look no further than CNCharger's Lagging Cow Cannon.
The Mechanism is simple. Build a room that is 3w x 3h x 4l, have 12 dispenser facing the inside of the room, and wire them to a redstone computer that is 3 redstone dust on a 3x1x1 row of blocks with 3 torches on the side of that row of blocks and a row of blocks on top of the torches. Be sure to place an extra torce at the end of the dust on another block so that it doesn't go off while you load the cannon. Now load 9 full stacks of cow spawn eggs into each dispenser. Place a door on the only 3x3 wall with no dispensors, and remove the torch at the end of the redstone computer. Now watch as your game lags away. If it is too much, replace the torch you just removed, then break the door, and watch as hundreds of cows get shot out.