Actually it was not a planned performance at all.
I think they just wanted him to do karaoke and sing "We will rock you", so they handed him a mic without notice and he did do that for us.
He was so nice and funny. Every Japanese who saw this show just got to love him.
Anyway he was the first Hollywood actor who appeared live on the early-morning TV show in Japan.
After the appearance, he gave many interviews with the press, visited our Prime Minister, joined a Sony's event, appeared on another TV show(he played billiards there!), came to the stage of pre-screening, and even went to the gym in the intervals. I'm sure he is crazy. haha