I saw somewhere on the internet a clock where the hand of the seconds moves at random irregular intervals, but averages out to 60 moves a minute. Extremely frustrating to watch. Edit: here's a video of it running (somehow the seconds hand runs backwards) https://www.youtube.com/watch?v=HKU-zmNFSxw
https://www.youtube.com/watch?v=k1XSp5FmXBo > This clock is inspired by a post by ILAMtitan on the 43oh.com forums, which was in turn inspired by Vetinari's clock from the Discworld series of novels. Although the movement of the second hand is quite erratic, it ticks exactly 32 times in 32 seconds, and so keeps quite accurate time overall. The clock started life as a cheap $3 clock from KMart. It's mechanism was kept…
I will have to buy some cheap clocks and start tinkering.