Super Smash Bros. Brawl Cheats

If you play any kind of Brawl on the "Smashville" Animal Crossing stage when your Wii's internal clock is set to a Saturday between the hours of 8:00 PM and midnight, K.K. "Totakeke" Slider will appear in the background of the stage and serenade your brawl.

Tap the D-pad down while using the following characters in the appropriate stages to trigger mid-battle conversations:

Fox/Falco: Lylat Cruise, Corneria (Melee stage)
Wolf: Lylat Cruise
Snake: Shadow Moses Island