Actually, yes I do -it is something handed down to me by my parents.
I was not allowed to sit on my father's chair, and somehow, even though I vowed some things I would not do that my parents do, this is one I obviously have learned.
Occasionally when I have visitors, someone sits on my chair, but unless they are really good friends, I will not say anything.
Now that I think about it, it is quite a stupid habit.