I find that one surprising in that most people don't know that the credit that says "M Jackson" refers not to Michael Jackson but a total unrelated Mick Jackson from the UK:any surprising ones? I'm trying to think of some now but can't.
A lot of people suggested Hanging on the Telephone, originally by The Nerves but I reckon music geeks on here would all know that. And Denis and Tide is High are even more well known to be covers I guess. Also Step On by Happy Mondays pretty much a cover but those are all kinda perennial favs I think.