VIDEO: Unbreakable Kimmy Schmidt's Ellie Kemper Once Played a Pet's Worst Nightmare

It's hard to imagine the irrepressible Ellie Kemper playing a bad guy, but that did in fact happen at one of her earliest gigs.

"I played a veterinarian's assistant in an instructional video ... on how not to be a bad veterinarian's assistant, so I was the villain," the Unbreakable Kimmy Schmidt star tells TVGuide.com.

Even so, we're sure her villainous V.A. was as adorable as Kimmy singing the Bunny & Kitty theme song -- or Kemper singing the last song she had stuck in her head. Check it out in the full video above.

Season 2 of Unbreakable Kimmy Schmidt arrives on Netflix on April 15.