The Big Bang Theory had its fair share of behind-the-scenes secrets and dramas throughout its long run. Why did Kaley Cuoco and Johnny Galecki deny their romance for so long? What made a jacuzzi scene so challenging for Kevin Sussman? And why was Jim Parsons afraid of ruining the show’s reputation?

Leonard and Penny's relationship was complicated, but Kaley Cuoco and Johnny Galecki had amazing onscreen chemistry, because the actors were secretly dating off-set! And this isn't the first time Johnny has dated a castmate.

Kaley Cuoco Kaley had to spend weeks in the hospital after breaking her leg, but the directors decided not to write her injury into the show. The situation repeated itself when Mayim Bialik got into a horrible car accident. Watch this video to find out how their condition was explained in The Big Bang Theory!

You will also learn the touching story behind the invisible baby of Howard and Bernadette, and how The Big Bang Theory cast proved that the chemistry between them was genuine.

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