It's kind to help a roommate in need.
John and Eric are roommates at home and Eric needs a ride to the store to get dinner.
John wants to go to a movie tonight.
John offers to drive Eric to the store, goes to the movie and picks Eric from the store when it's over.
John ignores Eric's needs and takes the only car to the movie theatre.
Eric feels happier and likes John more.
Eric is left hungry and resents John as a roommate.