"…here we are on Castle, and we’ll be doing a scene, and the director will come and say, “Once you’ve finished your last line, just go nuts. See what happens. Say something. Wrap it up with a gag.” It’s the freest rein I’ve ever had on a television show; I keep pitching and swinging, they’re not all home runs, but once in a while you strike some comedy gold."
— Nathan Fillion talks about how he uses what he learned about comedy