It's never a good idea to go up against the character the movie was named for, or the actors whose names appear above the title.
Detectives can't figure out crimes any sooner than 10 minutes before the end of the film (even if everyone in the audience figured it out 10 minutes after the movie started).
The sorriest troop in the unit will earn the Medal of Honor attempting to save the most heroic one (if it's a chick flick, he will succeed, otherwise he won't).
Anytime a main character goes to "the big city" for the first time, the first girl he meets will think he's a complete freak, but will fall in love with him by the end of the movie.
If you are in a movie in which M. Night Shyamalan's name appears at least twice in the credits, it would be wise to stay away from water.
The mysterious villain will somehow be related to the hero.
The invincible hero will get his butt kicked at least once before the end of movie climax.
In the last scene of a movie, the villain will get the upper hand, but will die because they talked too long.
Moral of all Disney Cartoons: Anything you put your mind to, you can do, but not without supernatural intervention.