I start up a conversation and offer them a free book. I listen to what they have to say about their lives. If they are reluctant to talk to a stranger I put them at ease by talking first - open and friendly. I make a joke or something. It's a perfect match.
People feel lousy and complain when they're in long lines.
God has a message for people who complain. He wants them to know how to be filled with joy even when standing in long, slow lines. I have never failed, when standing in a long line to be able to strike up a friendly conversation with somebody - and they appreciate it because it helps the wait seem shorter. I like it too, because the waiting time is no longer dead-time . Christians pass by hundreds of witnessing opportunities everyday because we aren't really looking.