When Celine Dion sings a song for your movie, you can expect a big, emotional performance that will rule the charts this summer and be nominated for some Grammys or even an Oscar. She’s done it before (Titanic). With “Ashes,” the song is exactly all that, and the video has all the required elements, with a stage performance and some movie clips. But this is Deadpool, so there’s more. He lends some out-of-character choreography to the stage show, and then offers a critique at the end. The kind of thing you’d expect from Deadpool.