If you have a clock with a smoothly sweeping second hand, and try to trace it's path ahead by 5 or so seconds (in other words, when it's at 0, you're looking at

If you have a clock with a smoothly sweeping second hand, and try to trace it's path ahead by 5 or so seconds (in other words, when it's at 0, you're looking at 5, at 1 second you are looking at 6, etc) the time will speed up and slow down in bizarre ways, and sometimes even look like the second hand completely stops occasionally. It's a combined effect of saccades and your brain drifting in and out of focus.