When an actor's performance in the trailer doesn't sell their performance but upon seeing the film, it's clear that it is actually a genius performance.
Origin: Anthony Hopkins was totally unbelievable as Richard Nixon in the trailer, but when Pete saw the film, he realized he'd been wrong and that Hopkins was genius.
Usage: Hugh Jackman looked ridiculous in the trailers for Real Steel but, man -- watch the movie. He really pulled a Hopkins. He's great.
First Used: 28 Days Later