Boom Box (WarioWare: Smooth Moves)

Boom Box is Orbulon's Boss Microgame in WarioWare: Smooth Moves. Its name is a pun on "boombox".

Gameplay
The player must keep the controllers up at all times. When the opponent's arm drops, the player must quickly keep punching him until he raises his arms again. This process is repeated until the opponent is KO'd.
 * 1st level difficulty: Lazy opponent.
 * 2nd level difficulty: Tougher opponent.
 * 3rd level difficulty: Very offensive opponent.

Trivia

 * The man in this microgame appears in Mona's microgame Wet Your Whistle as the player. In the second level of Wet Your Whistle, the liquid makes him look like the first opponent in Boom Box.