What was the most jarring end credits song you've ever heard in a movie?

I mean something that just didn't fit the tone of the movie, as well as not being a good song, especially if it was a great movie.

As an example, for me, it's the end credits song in edge of tomorrow with Tom Cruise and Emily Blunt. It was such a weird choice and did not fit the tone of the movie at all. I wish I knew the back story of why they used it.