The Dredd Effect

When the lack of excitement for a film is reversed by the surprisingly good experience the film turns out to be.  The opposite of the Prometheus Effect.  

Usage:  Dredd turned out to be a much better film than we expected it to be, so we experienced the Dredd effect when we saw it.  

Usage:  It's a shame more people didn't go see Rise of the Guardians -- they would've really been hit with the Dredd effect, liking it much more than they ever thought they would.

First Used:  28 Days Later