'The Big Bang Theory': Bob Newhart says guest stint 'was like a rock concert'

Bob Newhart knew if he was going to do television comedy again, he wanted to do it with a bang.The veteran of several series -- including his long-running "The Bob Newhart Show" and "Newhart" -- found his wishes met by "The Big Bang Theory," so he guests on the CBS sitcom Thursday (May 2). The famously low-key humor icon plays "Professor Proton," a veteran TV personality recruited by fans Sheldon and Leonard (Jim Parsons, Johnny Galecki) for a personal appearance.Though he also has turned up on such shows as "NCIS"and "Desperate Housewives," Newhart confirms to Zap2it that "comedically, I haven't really been doing that much. First of all, I have a thing against laugh tracks; I can't do a show with that. It's sterile to me. It's not part of the genre the way I grew up with it."It started with 'I Love Lucy,' then 'The Honeymooners,' then 'All in the Family' and 'The Mary Tyler...



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