Fruit Cart Rule: In any chase scene at an exotic locale, a fruit cart will be overturned.
Talking Killer: A killer who has the upper hand/gun, talks a lot about how psychotic they are, until the cavalry arrives to save the day.
Non-answering Pet: If someone calls their pet more than once without a response, that pet is dead!
In a Dead Teenager Movie, the girl who exposes the least skin is inevitably the only survivor.
Clint Howard scene: A token part always appears for Ron Howard's brother in any movie that Ron directs.
Universal Movie Computer Operating Laws: All computers have digital speech and/or a personality. All teenage computer users are hackers who own a modem.
eBook Ebert's Little Movie Glossary