I've seen the hypinosis one, and it doesn't work on youtube like it should
Image is too pixelated, and the "high" effect ends up now being that strong, but still works none the less. I remember when I was a kid I went to the local college for a field trip and had a two hour presentation on optical illusions. Some of the ones they showed were crazy. One of my favorites is the one with the screen full of checkered circles that look like moving snakes no matter where you look.