I would have went with his delightfully charming way of telling some skanks to leave, but i think this is underrated and actually does a far better job establishing what a cocky sleazebag Clarence Boddicker is.
He just got arrested by Robocop and what does he do? Spit on some police paperwork and confidently demand his attorney. He knows he'll walk, he has no concern whatsoever for what the cops might have on him or what might happen to him. He couldn't be more sleazy or comfortable with his dirtbaggery. The cops should have just let him go right then and there.
The Kurrgan from Highlander, basically every single thing he does in the entire movie. Easily one of the greatest, if not THE greatest, villain in movie history. Holy crap Clancy Brown is a glorious, brilliant human being for delivering a performance of this stunningly profound and badass magnitude.
Moments where no matter how evil they are, you have to respect the sheer badassery of it.
My fav three would be:
Moriarty buying out the restaurant AND their patrons to kill Irene Adler privately. in Game of Shadows
Joker putting the mob on notice in his first TDK scene
And my all-time one, Grand Moff Tarkin casually blowing up Alderaan
The Game of Shadows thing is just so irritating because it was obviously done so the studio could just have another hot lead chick in the movie, what other reason is the point to kill her off, if they were planning to do it they might as well have done it in the end of the first movie. It would have had more impact and not felt like an after thought.