We all know him from 'BBT', but who remembers him on 'Roseanne?' 🤔

Dated co-star Kaley Cuoco for about two years. 💑

Mayim & Johnny shared their first on-screen kiss back in the '90s. ❤️

George Takei was his favourite 'BBT' cameo! 👍

Johnny's Chicago nickname is so strange! 😂

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