It could be strangers exchanging gestures on the street or a scene in a random movie.

You'll feel like somewhere some time in the future or in the past, you couldn't tell, you have seen the scene actually played out, and you are the character in the scene.

It could be a song, a smell, a sound, anything at all.

That transport you to that familiar place.

Better known as deja vu, but deja vu doesn't quite explain it.

This, is more real than a deja vu.