Designed to test your memory, the first episode presents viewers with a mock-up crime scene. In a New York park, a man is mugged in broad daylight. Test your Brain: You Won't Believe Your Eyes But can you describe the robbery seconds later? And will your description be the same as that of the person next to you? Discover how details often go missing, forcing the brain to 'make up' memories. So what you believe to be true could actually be alarmingly false.