Plot: Jack Black breaks down his most iconic roles, including his characters in 'School of Rock,' 'Tenacious D in The Pick of Destiny,' 'Nacho Libre,' 'Tropic Thunder,' 'The Holiday,' 'King Kong,' 'Orange County,' 'Shallow Hal,' 'High Fidelity,' 'Jumanji: Welcome to the Jungle' and 'Jumanji: The Next Level. '