Actually, this video is not that hilarious. It’s mainly a group of Korean students dancing and trying to funny in front of the camera. You can say that this is a rehearsed effort to be funny.

Well, good job on organizing and inviting other students to join your group to make people laugh. It takes some guts to dance in front of the camera and doing funny dance moves. But, I think they need a bit of practice because their dance moves are not that synchronized.