The Emperor's New School - Season 2 Episode 7 -

Kuzco thinks that Llama herding looks easy, so Pacha makes him do it for a day. However, the Llamas end up drinking some of Yzma's potions and are turned into demons. Meanwhile, Kronk, who also had some of the potion, is trying to get a meal at Mudka's, but everyone keeps banning him.