Continuity mistake: As Brenda leaves the table asking "Does anyone need anything?", we see Bobby sitting by the table. When it cuts Bobby suddenly got something between his lips which weren't there before.
The Hills Have Eyes (2006)
Ending / spoiler
Directed by: Alexandre Aja
Starring: Ted Levine, Kathleen Quinlan, Aaron Stanford, Dan Byrd, Tom Bower, Emilie de Ravin, Michael Bailey Smith, Maxime Giffard
Doug rescues the baby from the nuclear testing ground (a fake town with dummies) and kills 2 mutants (Pluto and lizard) while the dog kills another one. Brenda and Bobby are attacked by the mutant leader and kill him. They all meet up and everything looks to be a happy ending - but as the camera zooms out, the shot is shown through a screened/binocular point of view as it had been throughout the movie when the deformed cannibals were watching them, hinting that the family hadn't killed all of the cannibals, and that they are still in danger.
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Answer: Pluto puts his hand over Brenda's mouth and Ethel doesn't bother to look over.