When Horace the Bartender announces that "From now on we fight to the death" (Herod vs. Sgt. Cantrell). Russell Crowe is to my immediate right:

The "turn your head and cough" scene in which we watch a bullet fly as if we were watching a tennis match (Kid vs. Scars):

The Kid states "I'm the new goddamn mayor of this town!" after defeating Scars: