Actor Quotes and aphorisms about some Robert De Niro ,, I always go back to how people behave. If you watch how people actually behave in a situation, it's... Sean Penn Sean Penn Sean Penn Sean Penn Denis Leary Denis Leary ,, Certain movies like 'Wag The Dog,' we used improv on every scene that we did. Pretty much, we would... Denis Leary Denis Leary Denis Leary