[PTTG]

Certainly, the spookiness of the fires all going out at once is the key element here. If the PCs are cursed so that fires won't stay lit in the whole village so long as they're around, then that's annother matter entirely.

On a related note, rot. Wood rotting overnight and iron rusting away after a day in the shed would be a big problem.

Reliably competent people getting confused and lost on familiar roads could be a problem. "We sent Bill to the manor, but he came back hours later and said he got lost and never reached it... It should have taken him only some minutes!"

Metallic, clearly artificial cubes in the hen's eggs -- just small enough to fit in the shells. Not harmful, but how did they get in there? Are the eggs safe to eat? If not, are the chickens? Are the cows?