This is the kind of thing to happens to everyone at some point, right? You're cranking out a song at your local karaoke joint, maybe a few drinks in, and you maybe don't sound your best. Suddenly, the actual artist whose song you're butchering joins you and it becomes a duet. I've seen it a million times.
Of course that never actually happens, unless maybe you're Charles Barkley singing the Boyz II Men classic slow jam, 'End of the Road.' Chuck gets through the first verse and it's not good, but luckily the group is on hand to bail him out. Typical.
Also, if you're the person shooting video like this, turn your freaking phone sideways.