In Teenage Mutant Leela Hurdles, the professor is trying to find a cure to them getting younger and younger. He clutches his afro and says "Think you disco duck!"
I highly recommend. In the new seasons one of the producers even proved a theorem just to write an episode about it. They include the proof in the episode...
It's so great to be a complete newbie posting a mistaken answer. As long as all the downvotes to your post come before your first upvote, you're fine...