It's hard for me to have a conversation with a stranger, but I also recognize that it's important to be open to others and extending myself a bit won't kill me. If someone sits near me on an empty bus, as long as they aren't threatening me in any way I just figure they're an outgoing person, or that they're very lonely. Again, doesn't kill me to open up a bit and converse. Sometimes it's a good way to learn new things about ourselves, or about life in general.