It's also a wonderful thing to play with, and that is what Medium Awareness does; the characters acknowledge and interact with elements and conventions of the medium that shouldn't technically "exist" in-universe.
Suddenly the characters can hear the ominous background music or the disembodied narration, they can read the subtitles at the bottom of your screen, and they can tell when it's almost time for a commercial break.
Cut to film: of them appearing at the door hesitating and then closing door.
"It has been a long time since my last proper MMA training and although I still train in Brazilian jiu-jitsu, it will take me at least one year to be ready for a proper fight.
There are a lot of attractive, single people with money to spend and free time to fill in Dubai.
Left the Background Music On is a specific inversion.
Fourth-Wall Observer is what happens when a particular character has this on full-time and the rest do not.
Audiences are good at figuring out which elements of a work are on which side of the Fourth Wall.