Melissa Rauch, beloved for her role as Bernadette on The Big Bang Theory, recently opened up for the first time about a surprising moment involving her co-star Kaley Cuoco. Fans of the show, who have adored the cast’s chemistry for years, were stunned by what Rauch had to say.

Jumping straight to the conclusion, Melissa revealed that during filming, Kaley Cuoco once pulled off an unscripted prank that left the entire cast and crew in hysterics. In a key scene, Kaley purposely ad-libbed her lines and added an outrageous joke that caught everyone off guard, causing multiple takes to be ruined from laughter. According to Melissa, it was one of the most unforgettable and hilarious moments on set — and a perfect example of Kaley’s fun-loving, unpredictable nature. Fans, used to seeing the polished final product, were shocked to learn just how wild and spontaneous things could get behind the scenes.