A fellow gets on the subway today with a medium sized bag.
He opens it up and fishes out a folding chair. He then makes room amongst the packed car for his chair.
He proceeds to sit down comfortably, open up his bag and grabs a sandwich and coffee.
Bringing a folding chair on the subway with you; brilliant.
But what happens with an elderly person gets on, are you obliged to offer her your folding chair?