I never realized this before, but whenever Let's go Crazy went into Kiss back then, the intro to Kiss was actually a version of 17 Days... listen to that bassline...

Hey yeah, that's true! He always does stuff like that. He's the king of plagiarizing himself. Like the guitar lick from Rave that used to be in The Max, and Mr. Happy before Take Me With U (or Raspberry Beret, can't remember) on that VH-1 show.