I think what is most distubring about this video is what happens around the 10 second mark, when the body-slapper gently puts his hand on the shoulder of the beat-boxer, and then they give each other that ... look.
You know the look between two cousins... two CLOSE cousins... that live in Arkansas?
That look that guy gave Ned Beatty in DELIVERANCE?
That look that two prison buddies give one another when the it's time for lights out?
yeah ... freaky.