Hilarious Musical Collaborations

I like them. I like finding them, and I like discussing them. Usually I can't tell if my love is ironic or not.

You could probably have a whole mega-section solely devoted to Axl Rose, but this is my favorite so far -- http://www.youtube.com/watch?v=zzZXXCDakjY

Reasons why this performance rules:
- when this originally aired (in the early 90s??) I was watching this with my father, who is an enormous Rolling Stones fan. I was captivated. His only response was, "Why did they bring out this jackass?"
- it's an awesome Rolling Stones song that gets very little attention;
- Axl and Mick engage in a tense battle of who can do their worst go-to stage moves (Mick's spirit fingers on steroids and Axl's ridiculous sway);
- the ABSURDLY unnecessary inclusion of Izzy onstage instead of Slash;
- Keith Richards singing the first stanza as if he's never heard the song before;
- and finally, the two performers are billionaires singing a song that's meant to be a reversely-ironic discussion of the common man.

And no, despite it's awesomeness, it's still not as good as this.

The only person who may rival Axl in the ridiculous collaborations department is Bono. But what would happen if somehow, the cosmos aligned and they joined forces? What if the two Kings of Silly Collab collided? Would the world explode?? What? One exists? Seriously?