'Big Bang Theory' Details You Never Knew (Including the Star Who Threw Serious Shade When Turning Down an Offer to Join the Cast)

The Big Bang Theory is one of the most popular TV shows of all times, and it has an extremely dedicated fanbase.

However, even the most devout fan likely doesn’t know everything about the hit series.

For instance, did you know that Sandra Bullock was supposed to appear on the show? Her role went to another very popular actor after her team sent a “polite decline” to the offer for a simple reason.

Revolving around Jim Parsons, Kaley Cuoco, Johnny Galecki, Simon Helberg and Kunal Nayyar, so much happened onscreen, but it turns out that just as much was going on when fans weren’t watching.

Following the grand finale of the spinoff series Young Sheldon this week, we did some digging and rustled up 12 facts about the show, including details about guest stars who turned down roles (that list includes a massive pop star), actors who were almost overlooked, onset romances, future plans for reboots and more.

One actor even admitted to using their dressing room for hook ups. Take a look and let us know what, if anything surprised you!

Scroll through the slideshow to check out 12 big secrets from the set of The Big Bang Theory…