If you break a taboo in a dream, does it count?
What the dream itself was about, I don't even remember. What I do recall is that as I turned to leave, and was going out through the door, I stepped directly onto the threshold.
Thresholds, like hearths, are loci of sanctity. The threshold of every building is inherently sacred, even the thresholds of non-sacred buildings like stores. In the old days, they would bury the foundation offerings beneath them, and in traditional cultures they continue to be places of sacrifice. A threshold is a god's place. They say that the Horned, god of the In-Between, sits on every threshold; it is his sacred place in every building, large or small, sacred or secular. Whenever you enter or leave a building, it's an encounter with a god. Welcome to the pagan universe.
So it's bad to step on a threshold. (One steps over a threshold, not on it.) Not bad as in murdering someone, but bad as in pissing toward the Sun; it's rude, a ritual violation that puts you out of synch with the Powers. It's important to be in synch with the Powers; our people have always felt so.