Haha love the Sleight of hand irregular wall clock idea. I once had a wall clock where the hand showing the seconds would sometimes jump backwards, it was extremely unsettling somehow because it was random. It really did make me question my sanity.
This used to be one of my recurring nightmares when I was a child. The three I remember were (1) clocks suddenly starting to go backwards, either partially or completely; (2) radio turning on without being able to turn it off, and (3) house fire. There really is something about clocks.