Cool topic.
When you're all alone at home and there's a homicidal maniac out to get you, you should dress in your skimpiest negligée and walk through the hallway, which will immediately go drafty and grow twice as long.
When a man and a woman wake up together, there are a few things I always notice: Sheets in movies are always L-shaped, reaching waisthigh for guys but up to the neck for women. The women always wear perfect make-up and their hairspray must be something amazing because there's never a hair out of place. Also, there's no such thing as bad morning breath: people waking up with invariably start kissing, even if they had chilli or a boozefest the previous night. Oh, and they never need a morning piss either, in fact no one in a movie ever needs the bathroom at all.
People in movies never need to pay for their drinks and food in bars and restaurants, and usually they've barely sipped their drinks before leaving again.
People know all the telephone numbers of any person they might need to call by heart and they never need to specify a date, location or time when they make appointments.
When people do their groceries (it's rare in movies though) they always get a free leek or a baguette so it will stick out of their shopping bag.
Never buy oranges - the paper bag you carry them in will invariably tear (but the person who helps you pick them up is probably the love of your life)
Never shower during the day - you will die. Especially if you've closed the shower curtain or if you're pretty.
Locks can be opened in about 10 seconds with a credit card or a bit of wire, unless it's the lock to a burning building with a helpless child or woman in it.
"Ugly" girls always wear huge glasses with thick rims. When the hero convinces them to take them off, all of a sudden they're the prettiest girls in town.
When a man so much as kisses a woman's neck, she's in pure exstacy and immediately "ready for it"
It's easier for one guy with six bullets to kill an entire regiment of bad guys than it is for three bad guys with automatic guns to kill a single guy.