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Behind-The-Scenes Secrets From The Set Of 'The Big Bang Theory'

Updated April 1, 2021 20.9k votes 4k voters 413.9k views15 items

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If you're a fan of The Big Bang Theory, the time between each Thursday night can feel like an eternity. In the meantime, might as well fill the void by going down the rabbit hole of fan theories, or reading behind-the-scenes stories from The Big Bang Theory. Many of these tales are as hysterical as the show, and give audiences a more in-depth look at what makes everyone's favorite sitcom so special.

These tidbits reveal everything from secret relationships to cast member phobias. The show on the air remains much different from the original pilot, and the cast sometimes seem the exact opposite of their television counterparts.  

  • 5

    The Cast Didn't Know Kaley Cuoco And Johnny Galecki Were Dating

    Photo: CBS

    As the stars of a hit sitcom, it's hard to keep your private life a secret. The Big Bang Theory co-stars Kaley Cuoco and Johnny Galecki, though, maintained a private relationship under everyone's nose. Cuoco and Galecki spilled the beans in 2010, confirming their coupling ended amicably after two years. Everyone, including the people they spent the most time with on set, were shocked. Cuoco stated:

    It was a wonderful relationship but we never spoke a word about it and never went anywhere together. We were so protective of ourselves and the show and didn’t want anything to ruin that. But that also made it sad, too. That’s not the kind of relationship I want-I don’t want to be hiding. We couldn’t do anything. It wasn’t as fun as we wanted it to be. Everyone was always asking, and we deny-deny-denied. And I’m like, “Why am I denying this person that I love?” It took a little bit of a toll on me and I think it did for him, too... We knew how to keep it deep inside and never bring it on that set, ever.

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  • 6

    The Show Used To Have A Different Theme Song

    Video: YouTube

    The opening theme song for The Big Bang Theory is so engrained in fans' heads now, it's hard to imagine the show without it. "The History of Everything," composed and performed by the Barenaked Ladies, is played after the cold open of each episode - and it's undeniably catchy. But the first ever episode featured Thomas Dolby's 1982 hit "She Blinded Me With Science" as its theme instead. 

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  • 7

    Johnny Galecki Was Supposed To Always Wear A Suit

    Photo: CBS

    In the series, Johnny Galecki's character, Leonard, dresses very casually. In fact, he is almost always wearing a hoodie. But in the unaired pilot, his character wore a dark suit. In the original script, Leonard and Sheldon's fashion is much different - they dress more old-fashioned than in the current version of the show. Leonard's traditional-looking dark suits eventually became the usual costume choice for the character Priya, instead. 

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  • 8

    "Soft Kitty" May Have Been Stolen

    Photo: CBS

    Co-creator Bill Prady claims he heard "Soft Kitty" (the song Sheldon uses in the show to be calm down) being sung at his daughter's preschool. Prady says he assumed it was in the public domain, and added it to the show. The cute children's song has been used multiple times in the series, as well as printed and sold on Big Bang merchandise. 

    In 2015, the family of a New Hampshire teacher named Edith Newlin sued CBS and Bill Prady Productions for copyright infringement, alleging they lifted lyrics from Newlin's 1937 song "Warm Kitty." But is it really the same song? The 1937 song begins, "Warm kitty, soft kitty, little ball of fur." The Big Bang version starts out, "Soft kitty, warm kitty, little ball of fur." Sounds pretty close. 

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