I've watched all 200 segments twice yet I still had to think... most definitely the bike one, it was both humorous and adorable

I'd also have to say the bit momentarily in his nightmare, maybe because it implies to me that he tends to get nightmares of being nude which is also adorable. And then there's the episode in the newer seasons where he miscalculates his stain remover's power up in the atmosphere which ends up eating away at his cloths, that one is Especially good too

Almost forgot, but the nature documentary bit where he realizes he's technically being recorded by the narrator is pretty funny too lol that one is also one of my favorites.. and, (This is so long Jesus) the literal ass shot of him flinging himself to his escape pole, the way he clinged onto it was so adorable despite the probable pain going down it, but regardless