On the way to work today, I realised quite unexpectedly that Blame it on the Boogie by the Jackson Five and The Milkshake by the Village People are exactly the same song. I haven't checked, but I'm pretty sure they're even in the same key.
Aren't you glad you don't have my brain?
Addendum: In my opinion, the funniest line in King Missile's Detachable Penis is: “He wanted twenty-two bucks, but I talked him down to seventeen.” For some reason, that's the line that pushes the absurdity over the edge.
Even weirder, there is a Wiggles song (forget which one, but it's on one of their Xmas videos) that is exactly the same as "We're not gonna take it", the old Twisted Sister song.