When I saw this video, there were a handful of friends that popped into my head that I could see doing exactly the same thing. You know who you are.
This man (I'm assuming gay) gives what appears to be an impromptu - yet secretly rehearsed - lip sync and dance number to Tina Turner's "Proud Mary" at a wedding. You know you have that one (or more) song you have handy for just such occasions.
Mine - Madonna's "Like A Prayer." My partner David's - Reba McEntire's "Fancy," Madonna's "Borderline," and the complete catalogue of Selena. My friend Will's - Tina's "Proud Mary." You all have at least one friend that channels the spirit of Tina now and again.
Check it out.