Anyone familiar with the Capitol Steps will enjoy their Lirty Dies routine. I first heard Lirty Dies in my Exceptional Phonologies class a couple years ago. Listen to this one (there are a bunch; if you like this one, you'll like them all). If you're confused, it's all about switching onsets. It happens to all of us (we call it a "slip of the tonuge" or a Spoonerism), and it's a lot of fun to hear it done deliberately--and in such a funny way!
Let me know what you think of these--it could be that I'm the only one who's a big enough dork to think they're hilarious.