I would sometimes catch the seconds hand of our bathroom clock going backwards - but it only ever happened the moment I looked at it. Nowadays I know why - the

I would sometimes catch the seconds hand of our bathroom clock going backwards - but it only ever happened the moment I looked at it. Nowadays I know why - the seconds hand would vibrate a bit after every movement, and if my eyes "saw" it going backward for a fraction of a second after focusing on it, the brain would complete that to "yep, it just went back a second".