This sound effect is a simple light switch click. It comes from an original sound library and has been used in meme videos for years.
Background
The light switch sound is a basic mechanical click that you might hear when flipping a wall switch on. It has a very straightforward, dry tone that makes it feel like it came from an old house.
People have used this sound in meme edits for a long time. It works well when someone turns off a light right after saying something important or when a character finally goes to bed.
Why It Became Popular
The sound became popular because it works with a lot of different meme formats. You can slap it on almost any video and it feels natural without breaking the scene.
It also has a universal quality that makes it work across different languages and cultures. The click just sounds like a click, no matter what video you put it in.
A simple click that gets used a lot in online edits because it fits naturally into almost any moment.