Kaley Cuoco and David LettermanSharp-eyed fans of 'The Big Bang Theory' may have noticed that Kaley Cuoco was absent from a couple of episodes this season, and largely immobile in several others. On 'Late Show' Cuoco shared with David Letterman what happened, and showed the scars to prove it.

She slipped off her horse, and then the horse "got a little trapped" and backed across her leg. "I actually thought he was walking on leaves," she said. "That's the way the sound of my leg was."

A scar on the side of her ankle represented where the bone came out, and there was another longer one down the front of her leg. "Now I have two metal bars in my leg, but the good thing about that is I know when it's going to rain," Cuoco laughed. Watch the video after the jump.