Why do movie bombers always label the remote controls with signs like "On" and "Safe"?

Why is there always a red and green light on the remotes too?

Why is does a director put a shot of an object that will be used later to kill someone at the beginning of the film?

Why can't I get a 555-XXXX number for my phone?
WHy do cell phones always work, never break up or drop calls?

Why do people bother to shoot zombies, vampires or monsters that are 10 time larger than they are? They are either dead, can't be hurt or way to big to kill with a few bullets!

If a crime commited during a murder-mystery flick is solved at the end does that change it to just a murder movie?

Why is passing gas so funny in a movie?

Why do people being chased by a criminal go home? Why not drive to a police station or donut shop?