Hawking made a surprise appearance in the spring of 2003 on 'Late Night with Conan O'Brian'. Jim Carrey asked him if he would take part in a comedy sketch for the show. Hawking accepted and taped webcam footage. On the show, Carrey began discussing cosmology, and on cue Hawking called him on a cellphone, admonishing Carrey not to bother because "their pea brains cannot possible grasp the concept." He soon after excused himself, saying that he had to go because he was watching Carrey's movie "Dumb and Dumber", and "marveling at the pure genius of it." Hawking later hosted Jim at his home in Cambridge.
