Tentacle fungus.

The spore had floated out of the building and headed toward the nearby woods. Floating here and there it finally alights on a small clearing in the middle of some trees. Alighting it burrows into the soil and disappears. over the next week a small patch of mushrooms quickly sprang up in that spot. They seem to be of your average garden variety but something about them isn't quite right. They seem to twitch every so often.