The Big Bang Theory: 20 incredible things you definitely didn’t know

The pilot episode didn’t include Kaley Cuoco as Penny. Instead, the role of the female lead was given to Amanda Walsh and was called Katie. Sheldon and Leonard were supposed to meet her while she was crying on a sidewalk because her boyfriend had kicked her out of the house. However, Katie’s physical appearance didn’t go down well with the test audience and she was replaced by Penny.