Hm, people tend to notice changes and not the actual state.
I once rode in a bus and the driver was chatting with someone, not paying attention. We were nearing a crossing and stoplight was red. He was slowing down and stopped. But just when we stopped, the light turned green. But he did not notice and now he was waiting for a change. When the light turned red again, he continued... a bit scary, but an interesting demonstration how lazy the brain is.