Rhythm Heaven/Funny

Rhythm Tengoku

 * There's something hilarious about the goofy noises the ghosts in "Shiro Obake"/"Sneaky Spirits" make, both the "oink-oink" sounds they make when sneaking and the needlessly dramatic moans they make when successfully shot.

Rhythm Heaven/Rhythm Tengoku Gold

 * The bonus material for "Freeze Frame" reveals that the woman who passes by at one point is the photographer's girlfriend, who was feeling ignored and deliberately photo-bombed him in order to get his attention.

Rhythm Heaven Fever/Minna de Rhythm Tengoku

 * "Donk-Donk". It's so completely bizarre that the American version of the game doesn't even try to describe what's going on.
 * Watching barnyard animals catching the kicked footballs in "Double Date 2".
 * During Remix 7, the action briefly switches back to Karate Man... who doesn't actually do anything, he just lays there watching TV for a bit before the remix switches to another game. Even funnier is that he's apparently watching the Karate Man game from Tengoku.
 * "Quiet, guys, my show is on."
 * Ringside.
 * In Samurai Slice 2 during the obscuring story thing, sometimes the man says something to the effect of "Buy me a new bunny!" instead of saying "Save my bunny!"