These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Happening
Anvilicious: There's plenty of this throughout the film.
Ensemble Darkhorse: John Leguizamo's character is the most sympathetic and the best acted in the bunch; of course, this means that he's one of the first to die.
Narm: The entire film. Particularly the lawnmower scene.
High Octane Nightmare Fuel: For all the movie's problems, there are a few genuinely creepy/horrific scenes.
The phone call where we hear a young girl afraid and confused about what's happening, and then jumps out the window because there was a tree near it — all as her mother tries to communicate with her and tell her to close her window. Everything else can be accepted as regular horror movie gore, but damn it, that is unsettling.
The old woman walking around the outside of the house and smashing her head against it, finally crashing in through the window. Gahhh.
Paranoia Fuel: As stupid as the plot is, trees may seem a little freaky after this movie.
So Bad, It's Good: The movie is so hilariously awful, one could think that it's really a M. Night Shaymalan satire of horror films; at one point, the characters are menaced by the wind. There's also Mark Wahlberg turning in the narmiest performance this side of Nicolas Cage in The Wicker Man.