Yeah there are some Yoda raps that are kinda dirty (I'm not referring to CBielich's one, I never heard that one). I got the Star Wars Gangster Rap, I like it a lot.
Mine has Jaba, Darth Vader, emperor and yoda and some ojther charecters. Its pretty funny. Here is a link to download it! http://www.bielich.com/cesar/Cheech%20&%20Chong%20-%20Star%20wars%20smoking%20weed.mp3
here is a yoda rap I wrote: [insert funky beat her] Yoda rap, Yoda rap. My style may be dope, But my rythm is crap. Yoda trained luke, then took a nap. The Death Star came to Alderaan, Then came a big *zap!* The Falcon landed in an asteroid, and got mynocks on its mudflap. Darth Vader liked to kill things, What a mean chap. go to see the movie, when it ends you gotta clap. When luke gets lost, he has to use a map. Han and Chewie are some thugs, they like to bust a cap. This is a stupid rap, and thats just whack. Tada! All done! What do you guys think?