I once did that in the subway Had to bring a chair to university for a art club. I rode with it every day for a week to and back from the unversity, sitting on it in the station (while waiting on the train) and in the train.
People were searching for a camera the whole time or making photographs of me xD
It looked a bit like this one: [link] I wasn't big, but it was old, looked a little bit like a small throne and it was pretty comfortable xD I sadly don't have a photo from it, since we destroyed our chairs as finish of the art project, but the way alone sure was awesome.
Maybe I do that again just for the joke and film it secretly xD