No explanation is necessary for why our hero can hear a ringing telephone but not the movie's soundtrack, or why the space ship is menaced by the Negative Space Wedgie, but not by the opening credits drifting by outside the ship: it's something we accept as part of our Willing Suspension of Disbelief.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.Generally, this awareness is brief; it's used for a joke or two and then never mentioned again.
How does this react with my skin to cure the problem?Used this way, it's Lampshade Hanging as applied to Paratext. Compare with other metafictional devices, particularly Painting the Medium, which uses Paratext and artifacts to tell the story, and Reading Ahead in the Script which is exactly what it sounds like.Left the Background Music On is a specific inversion.'Course, there isn't really a basement, but he just goes off and we pretend. Actually what happens is he just goes off there, off-camera, and just waits there so it looks as though he's gone down to the basement.