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LANGUAGE

• Even when depicted as foreigners (including aliens from outer space) all actors speak and understand a common language (usually English) unless the film's plot depends on a language barrier.
• When foreigners appear in movies (hispanics in particular) they seem to be able to speak perfect english without making one single mistake except it seems they never manage to learn how to say "Sir" or "Thank you"... they always say "Senor" and "Gracias"

LIGHT

• A malfunctioning or burnt lightbulb usually means that someone is hiding in the room, ready to jump on our hero/heroine while he/she's busy hitting the switch or tapping the bulb.
• When someone lights a match in a dark old house, the single match has as much power as a 1000 watt bulb! Alternatively, they light a match, and then light an old oil lamp which has a vast amount of power.
• When people switch a light off, it will still be possible to see everything in the room, just in a slightly subdued/bluish colour...
• Lightbulbs blow up when:
something psychic happens;
someone opens the power box, rips out the biggest cable, and touches it to the rest of the stuff in there;
If the lightbulbs are in a row, they blow in timed sequence.

LOCKS

• Any lock can be picked with a credit card or a paper clip. Any safe can be opened in a few minutes with a stethoscope or some high-tech equipment with lots of blinking lights.