SI Now :Bryan Callen on why he prefers stand-up over acting

On Friday's SI Now, actor and stand-up comedian Bryan Callen discusses his two current box office hits, how improv changed his character in "The Hangover," and

On Friday's SI Now, actor and stand-up comedian Bryan Callen discusses his two current box office hits, how improv changed his character in "The Hangover," and why he prefers being a stand-up comic over acting.