Professor Lacer gestured to a chair, which scuttled across the floor and settled ominously in front of his desk.
The family story goes like this:
At one point my grandfather was a pretty heavy drinker. One day, while drinking, a chair walked over and tripped him. This so unnerved him, he quit drinking after that.
For me, the fact that the chair scuttled is just as ominous as where it ended up. Walking chairs hold grudges.