Simply stare at this for 30 seconds then look away at a white wall or a piece of paper and you’ll see the batman logo on the wall. This really works.
Stare at the black dot in the center for 40 seconds, and after some time, the image will change (as it’s a 2 frame animation) to show a black and white photo. Due to the special effect, you will see a full color pyramid instead of the black and white one. Try it, it’s amazing.