In "The Demon Seed," Master Fung, Dojo, Kimiko, and Clay get turned into plants. While Raimundo and Omi are tending to them, Omi grabs some kind of apple from Clay's belt area and eats it, causing the horrified cowboy to protest, "Be careful what you go pluckin' there, partner!"
In "The Return of Master Monk Guan", the Treasure of the Blind Swordsman summons a swarm of bats that then proceed to crap onto the monks. Incidentally, more paranoid viewers may note that bat shit is called "guano", especially since Raimundo calls Master Monk Guan "guano man" later in the episode.
"In The Flesh" has a really subtle one in which Omi, sitting behind Kimiko, has a wide grin on his face while they're riding on Dojo. If you pay close attention, you'll notice that he seems to be getting a nice view up her skirt.