Watch: Will Ferrell covers Celine Dion on Letterman

Will Ferrell doesn't appear on talk shows, he hijacks them. Actually, it's hard to tell if he goes anywhere without a fully produced performance up his sweaty sleeve. As such, his visit to Dave Letterman's show last night quickly shifted from polite conversation to inspired gimmickry when Ferrell told the host of his plans to help out Celine Dion, who's on maternity leave from her Las Vegas show. Then, of course, he sang a Celine Dion song. 

Watch Ferrell's fist-pumping, ladder-climbing rendition of "Power of Love" below: