you were sitting on the couch watching a horror movie, for a few days now you have felt like you're being watched, sometimes at night you'd hear walking in your house or knocks on a door, or the creeking of wood. Since you live alone you've been pretty creeped out by this. You've also noticed tapping of glass or fingerprints on your window.

that's when you're in the middle of a big jumpscare in the movie when you hear three faint knocks on your window.. tap.. tap.. tap, you're now scared.