Have you ever seen a photo so strange, or with something so unusual, that it made you look twice? It could have been an optical illusion, or just a cleverly timed shot that makes something appear different than it actually is- either way, you do a double take. Here, we've compiled 30 photos that are so unbelievable, you're going to have to stare at them for a little while. However, one thing you should keep in mind is that there is absolutely no Photoshop in these photos. They're all 100% real, and 100% prepared to blow your mind.