Mad Jack

Mad Jack is a large seemingly insane jack-in-the-box from the game Donkey Kong 64.

After opening Frantic Factory's boss door, Tiny Kong ventured inside of it. Inside Tiny found herself in a pitch-black room with several glowing squares on the floor. Venturing onto one of these squares, Tiny was surprised when they rose into the air. Suddenly, Mad Jack appeared from a large box that fell out of a nearby toy rejection chute.

Mad Jack first attacks by re-entering his box and hoping from square to square attempting to crush Tiny who has to frantically jump to different squares in order to avoid the crazed toy. If Tiny manages to avoid Jack he will then pop out of his box and begin hurling fireballs at the Kong. While Mad Jack is busy doing this, Tiny must press a switch on a nearby square, if the square the switch is on is the same color as the one Jack is on, then he will be electrocuted. However, Tiny will electrocute herself if the switch's color doesn't match Mad Jack's platform color.

Eventually, after being damaged multiple times, Jack will begin to hop around faster and also shoot energy blasts from his robotic eye, which create shockwaves when they hit the platforms. He will also turn invisible after taking four hits. In order to track where Jack is, Tiny must watch the sparkles that trail behind him when he jumps. Eventually Jack will sustain too much damage, and his square (along with all the other squares) will fall, and Mad Jack will (humorously) crash into the ground below. He was apparently destroyed.

Trivia

 * In the beta-version of Donkey Kong 64 Mad Jack was known as Junk-in-the-Box, along with having an extremely different appearance. Junk-in-the-Box is fought in a similar manner to Army Dillo and Dogadon, after throwing fireballs at whichever Kong he is fighting he will become vulnerable to having a TNT Barrel thrown at him. Also he resembled a clown and was slightly shorter. He was apparently replaced with the Toy Monster that Chunky had to fight in the R&D room in the final version of the game.
 * Mad Jack is commonly referred to as Quack-in-the-Box, due to a mistake in Prima's Strategy Guide for the game.
 * Mad Jack is listed as Jake-in-the-Box in the Bosses section of the versus book guide. The confusion in names (neither being correct) may mean his name was changed later in development.
 * It is said that Mad Jack's face and laugh both bear resemblance to Donald Duck.
 * When Fighting Mad Jack there is a menacing laugh that comes from time to time, that is NOT Mad jack, it is part of the boss music.