The 40-Year-Old Virgin
Steve Carrell is a comedy legend, and that might be due to his dedication to the joke. For example, the waxing scene in the 40-year-old virgin was all painfully real (emphasis on painful). However, the many expletives Steve screams out were all made up at the moment. So when he screamed out "Kelly Clarkson!" instead of a curse word, that was his genuine reaction...