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: United 93
Fridge Brilliance: After taking over the plane, one of the hijackers places a photograph of their target, the U.S. Capitol Building, on the plane's yoke. Near the end of the film, when the passengers fight back and struggle with the hijackers for control of the plane, the picture is knocked off the yoke in the process, symbolizing that the hijackers will not hit their target.
Nightmare Fuel: The stark realism of United 93 being highjacked definitely counts as this—the panic, terror at seeing a fellow passenger stabbed, being forced into the back by a man wearing a fake bomb...everything.
Tear Jerker: Your mileage WON'T vary. You will cry watching this movie.