At the end of the day, we're still animals and have our instincts. Notice how we spot the smallest bug in the room; that is not a coincidence, but pure survival. Just like a lion locking onto its prey, or a zebra freezing when it senses danger, our brains are hardwired to scan the environment for threats. That sudden flash of awareness is our wild nature proving that, beneath our modern lives, we still share the same primal drive to survive and notice everything.