That Ground-Breaking Shoot-'Em-Up at the Beginning of Sam Peckinpaugh's Classic, "The Wild Bunch"

What would be my answer to the question, "So, what's your all-time favorite on-screen violence/mayhem?".........................................................................................P.S. A strong tip-of-the-cap would also have to go to Martin Scorsece's baseball bat bludgeoning of Joe Pesci at the conclusion of "Casino".