Does anyone else have "their" spot at someone else's house?

I just realized last night I have a specific spot I always sit at my son's house and at my friend's. Visited my son last night and someone else was sitting in "my" spot. I of course didn't say anything and sat somewhere else but it felt very weird. I got to thinking about it and realized I also have a spot at my friend's place too. Does anyone else have a spot at other people's houses?