Lestat crashing through the window of Louis' flaming mansion to pull him out. Followed up by his spectacular Shut Up, Kirk!... or better say, "Shut up, Louis!"
Louis slaughtering the entire Paris coven on his own after they murdered Claudia with exposure to sunlight, including bisecting Santiago with his own scythe, and burning down their theater. Brad Pitt didn't enjoy working on the film, but his fury is truly palpable in this scene; especially the Death Glare he gives the troop before, when Armand has to pull him away.