Mark Sweet warmed up audiences for “The Big Bang Theory” from day one, and the comedian tells host Jessica Radloff why the show was special from the very beginning. He shares the unforgettable marriage proposal that he helped facilitate before one show taping. Plus, he reveals which character most audience members chose to dress up as. Mark also recalls the times when Kaley Cuoco and Johnny Galecki would come into the audience and the frenzy it would cause. Watch all episodes of “The Big Bang Theory” on HBO Max.

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