Showing fear is one of the ways to summon these monsters – or stop the magic altogether. Laughter will also break the spell, and though someone might be unlikely to burst into giggles at the sight of an unhappy revenant or a horrifying pig, there is a Year Walk story in which two tiny, farting rats appeared in the path of the walker, causing him to laugh and forgo his chance of seeing the future. No farting rats, walking corpses, or multi-eyed sows appear in front of me this morning, but no ghostly funeral processions cross into the graveyard either.
