#1 is so...strange. In fact, this entire PMV post is really strange, except the middle one, that one is "normal".
But hey, no one has sent a backwards song yet, so maybe it will be interesting for some of you? I wouldn't go out and reverse everything else though, just testing the waters here.
1.) My Little Pony: Friendship is Magic - Opening (Reversed/Backward)
2.) Wild West Pony Hero
3.) Can't Let You Do That, Twilight!