When it's the ending theme rearranged, of course.
It's probably well-known that, in the Mega Drive version of Lemmings 2: The Tribes, the ending theme was rejigged slightly and used for the intro sequence instead.
There's a video of it here, if you're not familiar with this. (The audio sounds nice here, but there's nothing quite like hearing it from a real Mega Drive or Mega Drive II, as Matt Furniss was and most likely still is a master of getting incredibly good sounds out of this sort of hardware.)
This was actually the first version of Lemmings 2 that I ever played, and I was quite surprised a couple of years ago (not too long before I joined Lemmings Forums, actually) when I found that the intro was completely different in all of the others. It's similar between all of those, sure, but I don't think there's any other version that has an intro quite like the Mega Drive one - they all seem to follow after the Amiga original in their structure. Even the Acorn Archimedes version, which is closely related to the Mega Drive one due to being ported by the same company, follows the standard set by the Amiga intro (though it does
spin it off into a separate program).
I love the way this tune was used here - I think it fits really well, and it's certainly in tune with the presentation of other games on the same machine (so much so that I wonder if the publishing guidelines for the Mega Drive recommended it, in fact). I still can't quite accept it as an ending theme, because of this.
I was just wondering if anyone else was a fan of this version-specific change?