My funny video

First, look at this video!!
http://www.youtube.com/watch?v=J_UEDyb5lks
It's comedian act thier name is " summers".

One day....it happened.
The man in the blue T-shirt is " mimura".
He was rolling on the ball.
Look at 0:50 in this video.

His rolling style was unusuall!
And, he was very surprised by an unexpected crisis.

Everyone think this is very fanny .
I looked this video many times.