Plot: Sean Penn breaks down his most iconic characters, including his roles in 'Fast Times at Ridgemont High,' 'Mystic River,' 'Milk,' 'I Am Sam,' 'The Thin Red Line,' 'Dead Man Walking,' '21 Grams,' 'Flag Day' and 'Sweet and Lowdown. ' Penn explains what it was like to recently bump into his real-life inspiration for Fast Times at Ridgemont High's Jeff Spicoli