Vincent (Collateral, Tom Cruise): Calm and collected balanced with beserk outbursts of violence. All this from Tom "Pretty Boy" Cruise? I was impressed. See the dance club and jazz club scenes for all the evidence of badass-ness you should need.
Castor Troy (Face/Off, Nicholas Cage & John Travolta): A villain so badass, he needs two badass actors to play him. Jumping out of a 747 with gold plated pistols firing - Badass! Murdering an entire hospital staff while his face is cut off - Badass! Sleeping with the FBI agent's wife, flirting with his daughter, and beating the crap out of his daughter's boyfriend - Badass!
Johnny Ringo (Tombstone, Michael Biehn): The ultimate western villain, he scoffs as Wyatt Earp's brother's funeral procession passes by, "Smell that, Bill? Smells like someone died."
Alonzo Harris (Training Day, Denzel Washington): Denzel needed to be on this list and his American Gangster Frank Lucas portrayal just had too many decent values. Alonzo Harris, Washington's oscar-winning role, has none.
Because no list is ever long enough, here are some Honorable Mentions:
Vincenzo Coccotti (True Romance, Chistopher Walken): Not enough screen time to fully qualify, but damn is Walken badass in the scene with Dennis Hopper.
General Hummel (The Rock, Ed Harris): Completely badass right up until the moment where his bluff is called and he fails to launch nerve gas on the city of San Francisco.
Jack Nicholson (The Joker in Batman; Col. Jessep in A Few Good Men; Frank Costello in The Departed): Jack gets an honorary "body of work" badass award for continuously entertaining us with evil characters, and for being Jack Nicholson.
Agree? Disagree? Vote for your favorite Bad Ass Bad Guy!