What is your favorite cover song?

There are so many, and this one probably isn't my absolute favorite, but it's up there. I didn't realize it was a cover for the first few times I heard it, just a departure from what Iron Chic usually sounds like, but not so different that it doesn't sound like them. When I finally listened to the Ramones version, I was surprised. I don't think either band sounds like each other, and the IC cover is a pretty faithful interpretation, but somehow it sounds at home in both bands' catalogs.