He has the ability to make the most unrealistic situations seem compleatly realistic. I guess part of the this ability comes from taking reality and exaggerating it just enough to make it believable.
What I like about this video is the expression of fear despite the instructors attempt to alleviate it.
Why that strikes me is that I have a very strong recollection of one judo class where I was a trying to help a young lady. She was so frightened that as soon as she stood up, she immediately tried to kick me right between the legs.
Not quite as funny as the video though so enjoy.