A few years ago I got one of those Electric litter boxes that rakes the shit out, FREAKED out my cat and was afraid of his litter box after that, sold it in a yard sale later that month.
I can see that happening with ours, we bought her one of those water bowls that circulates the water one of them is completely freaked out by it.
Our cats are maddening because they will sit and watch me change the litter and then as soon as I've finished and stepped away they are in there, squeezing a bit out just because its new litter.