Haha, I just watched it again.
It's funny that so many people take him so seriously. He was like 20 years old here, just a kid. He calls himself "the human serviette" for a reason. SY all have a good sense of humour, and it's probably a relief to do an unusual interview where they can joke around and act sarcasticly and carelessly.
Even Courtney Love learns to relax and stop acting like a celebrity, who can't stand an over-enthusiastic kid fan.
http://www.youtube.com/watch?v=-XZCca-d10o