The first video sets it up the best. And don't let your eyes roll down to the second video, because the heading gives away the treat. (I've put a lot of buffer space in, so it shouldn't be a problem.) But when you got to about the 4:05 mark in this first video, then stop the it and head down to the second video below. –
(As I said, I've put a bit of space in here before posting the second video to help your eyes from wandering and seeing the heading of the second video, which gives something away.).
Okay, you've by now obviously reached the 4:05 mark of the first video. So you've got that one stopped and have made it here. And know what the charming surprise of it all is.
At this point, then, just click to this video below now, which has a better angle of the events on stage and more material at the end –