“That slap? Not written in the script…. That was a Sharon Stone Specialty!” Cuoco tells TVLine of Stone, who plays her mom in Season 2. “Came outta nowhere, that was a true reaction. I was in shock, which is exactly what we used.” She adds: “That was a wild experience, and it ended up being actually kinda perfect for the scene.” ALSO: Cuoco says she developed a rash on her leg while filming Season 2.