Many of Marin's fantasies qualify and much of what happens on Submaton Color.
Speaking of Submaton Color, Melan's chocolate-induced hallucinations are aguably more hilarious than Marin's because they're so unexpected.
Melan sees Erin skipping through the woods and singing "Baka! Baka! Melan no baka!" She pauses to lick him on the nose, and then skips off singing again. Then he sees Pyon doing exactly the same thing, but Melan knocks him out before he can get to the licking part.