Johnny Galecki's Favorite TV Show Is...Dateline?

In case you missed it, check out 'The Big Bang Theory's' Johnny Galecki play a hilarious — and very revealing — game of 'If You Only Knew' below.

Johnny weighs in on the gay marriage debate, the biggest flirt on the 'BBT' set, and what TV show he can't get enough of. 

Spoiler alert — it's not 'Big Bang.' 

Watch the link here...

And check out some other fan favorite 'If You Only Knew' moments here...

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Don Rickles: 'Don Rickles' Secret To A Long Marriage'

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