I was backing up our very large, high van into a parking spot today and then my parked neighbor to my right started pulling forward out of his spot as he had also backed in when he had parked. I certainly saw this movement not only in my periphery but also a bit in my line of sight as I was watching my backup camera. All of a sudden, I became so disoriented. Though I was braking, it felt like I was moving and I panicked. I pushed hard down on the brake and still truly thought my van had somehow started moving forward on its own and malfunctioned. To convince myself that I wasn't moving (or just to stop what I thought was an out of control van), I shifted immediately into park. This lasted approx. 3-5 seconds but felt like much longer. Does anyone know what this phenomenon is that would cause such disorientation?