The Quentin Tarantino-penned, Robert Rodriguez-helmed From Dusk till Dawn is one of the all-time great cinematic bait-and-switch movies, and the bait-and-switch moment happens to also be a great escalation scene.
Outlaw brothers Seth and Richie Gecko are spending the night in an adult club when they're treated to a sultry dance from Santanico Pandemonium. In the midst of it, a fight breaks out between some of the bar's employees and the Gecko brothers, and three men are slain by the duo in the process.
Or so they think.
As the Geckos point their pieces at the bar's remaining employees and patrons, everyone is weirdly relaxed. The only noise we hear is a rock song playing on the soundtrack. Richie's mutilated hand is gushing blood. Then Santanico can no longer contain herself. The scent is too strong. She mutates into a vampire, tackles Ritchie, and bites his neck. Richie collapses to the ground, dead (for now).
With this, the rest of the vampires reveal themselves, and the action pops off. Up pop the three not-quite-dead bar employees. It turns out that, like their comrade Santanico, they were never that alive to begin with. The Gecko brothers have found themselves smack dab in the middle of a Tijuana vampire bar.
Before this scene, we think we're in a shoot-'em-up, but when the going gets tough, we realize we're actually in a demented action/horror/comedy mash-up.