This video has been carefully designed to create a strong natural hallucination. Use full screen for best results.

If you follow the video’s instructions, when you look away you will continue to see wavy lines in your wall or on the floor. When the video ends and you look away, your brain still expects to see the waves, and therefore it creates them for you. Saying the letters out loud doesn’t really play a role, it just ensures that you are focusing on the center of the screen, where you can best receive the stimulus.

The resultant hallucination is temporary and should wear off within a couple of minutes.

Thanks to Kebmodee for bringing this to the attention of the It’s Interesting community.