I found this on http://www.spring.org.uk/2011/06/10-ways-our-minds-warp-time.php
The stopped clock illusion
The stopped clock illusion is a weird effect that you may have experienced. It happens when you look at an analogue watch and the second-hand seems to freeze for longer than a second before moving on.
I always thought this was because I just happened to look at it right at the start of the second, but this is actually an illusion.
What is happening is that when your eyes move from one point to another (a saccade), your perception of time stretches slightly (Yarrow et al., 2001). Weirdly, it stretches backwards. So your brain tells you that you’ve been looking at the watch for slightly longer than you really have. Hence the illusion that the second-hand is frozen for more than a second.
This happens every time our eyes move from one fixation point to the next, it’s just that we only notice it when looking at a watch. One explanation is that our brains are filling in the gap while our eyes move from looking at one thing to the next.
