They just hang around... watch TV, watch their friends grow up, feeling unhappy and jealous and those feelings are bad. They hurt.
18 seconds sound clip from the Poltergeist (1982) movie soundboard.
You can hear this line at 00:58:02 in the Blu-ray version of the movie.
Quote context
[...]
- And then some people die, but they don't know that they've gone.
- They think they're still alive?
- They resist going into that light however hard the light wants them.
- So some people get angry and throw things around, like in my bedroom?
- Yes. Just like in school. Like some kids are nice to you, some kids are mean.
- I got beat up once by three kids. They took my lunch money.
- Maybe they got hit by a truck and they're upstairs right now.
[...]