Ultimate Prize Song is sung by Peppermint Butler for Finn for winning the Wizard Battle tournament in the episode "Wizard Battle." It was sung very off key, but probably just that way to make the mood feel better.
Peppermint Butler: Get ready for the ultimate prize!
Watch her lips pop before your eyes!
Never in your life would you dream of... thi-i-is!
Never in your freaking life!
- On Cartoon Network Australia, 'freaking' is censored out, yet the particular word is kept in other situations.