I found this charming video of the singer Michael Buble getting heckled by some kid's mom to the point where he actually lets the kid sing a duo with him.
Michael Buble Heckled By Mom - Watch MoreFunny Videos
The neat thing about the video is that the kid turns out to be a pretty good singer. Now, I don't know if the video was fake in the sense that the kid is a plant in the audience or if it's just an example of confirmation bias (i.e. the video is viral because the kid was a good singer instead of a mediocre one). However, if it is a real video, then it's a unique one.