Haha, I've seen this set of video. Risako found a hard time, peeling a bananas? or...(You can't think of anything else, can you?) and another one that she kept saying her name wrong. She has been nervous in front of the camera.
I was told by a friend who studied abroad in Japan that it is considered sort of obscene there to eat a banana without peeling it all the way first. O__O'