It's rude to take up more than one seat.
Ralph and his girlfriend Eliza get on a bus and look for a place to sit down.
Ralph wants to sit on the bus.
Ralph sits down in one empty seat and lets Eliza sit in the other.
Ralph sits down in the only two empty seats on the bus.
Ralph and Eliza ride comfortably on the bus to their destination.
Ralph is relaxed while Eliza is annoyed that she has to stand.