Wow. Just wow. I'm a huge fan of the 'Fast and Furious' movies, and to see Vin Diesel start singing to Katy Perry is quite a surprise to me. Didn't realize that he had it in him.

You'll notice in the video he gets up close and personal with his followers, he thanks for their support, so why not let loose and sing a little "Dark Horse" right?
I've only seen performances like this at the karaoke bars.