One episode has Kirby kicked out of the castle by Dedede. His friends try to build him his own house. After many trials and much tribulation they succeed, only for Kirby to take up residences in the tree nextdoor! Though the bird he'd stolen the tree from seemed happy with it...
Meta Knight sparta-kicking Dedede's car down a hill—after saying he was his most loyal servant.
The first time Kirby becomes Mike Kirby in Episode 31. Even the NME Saleguy had to send him back.
Prior to Kirby, though, the Cappies were trying to sing oldies songs. Even earlier, Escargoon sang "Hound Dog".
The entirety of the pie episode, with almost everyone in the main cast getting hit by a pie in the face at least once. Even Meta Knight.
Even in the dub, right after that happens, he glances to the side and announces, "I feel...dirty..."
Really, Meta Knight's status as The Comically Serious lends itself well to these kinds of moments. Another example would be in Episode 61, where everyone else breaks into dancing while he just stands there stiffly.