What is your favorite "mental breakdown" scene in film?

A mental breakdown can mean the actor (or actors), go on a long rant about their feelings, start yelling gibberish, or just snap emotionally. My favorite is when Bruce breaks down on air in Bruce Almighty. https://www.youtube.com/watch?v=-Bprg2_s9mg​links to the scenes would be great! via /r/movies https://ift.tt/3rbG1ma