Jon Stewart was quite playful as he signed autographs outside the CNN building. He had a frightful look on his face for a split second when asked if he had any well wishes for Katy Perry and Russel Bran, thinking something bad happened to them. Once it was clarified that it was for their wedding he looked relieved and continued signing. Jon also seemed bummed when discussing the death of Tom Bosley of Happy days saying that it was a real drag. His favorite character on the show was Fonzy of course...Heeeeeeeeeeeeeeey can you blame him!!!