The Bird Lady
A mysterious stranger who will silently stalk our hero until the time when the hero can't escape. The stranger approaches, reaching for them, and then ...
Grand Theft Easy
In movies where characters need to steal a car, they will have very little trouble locating spare keys or otherwise getting the car started.
The Slasher CPR Missive
If you're in a slasher movie and think you killed the killer, you didn't. Don't slowly walk up to him and check.
The Scooby Doo Corollary
There's a killer after us...um, I have an idea. Let's break off into small groups.
The Compensatory Cha-Cha
When a bad movie tries to trick you into thinking it's good by using a wacky song and dance.