Any time you have a hard wood surface, and rolling chairs with floor safe casters - there is always the worry that someone will sit down and go flying if their chair takes off from underneath them.
I've seen it happen!
Add to that scenario a house that is 138 years old, and you've got an uneven floor situation due to age that sends chairs rolling away on their own, even without a person sitting in it.
It's quite funny at times - but also not.