Sometimes our eyes can play tricks on us... A shadow that looks like a person, a reflection that makes us think we've seen a ghost - whatever it is, optical illusions can make our imaginations go wild and really mess with our brains.
Here are 24 unnerving photos that range from funny to creepy - which one freaks you out the most?
1. Batman + Catwoman = Catman!
2. When you get home to find your wife has grown a man's head
3. A man without a head or a kid without a face? What's your verdict?
4. Nice pants!
5. 'Toon-shaded' jeans... Would you wear these?
6. Mother Nature proving she has a wicked sense of humor!
7. When a hiker perfectly blends into the surroundings!
8. Imagine playing hide and seek with this pooch!
9. Praying mantis or an orchid... Either way the colors are awesome
10. When stacked chairs become a sculpture
11. A work by Daniel Arsham: a wall clock that fell and took the wall with it!
12. Would you be able to tell the difference between white eggplants and hardboiled eggs?
13. You'd be forgiven for thinking that this radiator is a smiling robot!
14. A human tree
15. Have you ever seen a Siamese rose?
16. A decorative pile of snow peas!
17. A school playground that looks like a scene from a video game!
18. The gateway to Hell...
19. A cop who also works as a taxi driver?
20. An astonished piece of bread!
21. Is that a furry creature on her shoulder?
22. A mutant egg!
23. Cupcakes or cacti? Would you dare take a bite?
24. Two seconds after a vampire got caught in a ray of sunshine...