Offer $1 to anyone who can name ten beers. If someone names only five, give him a dollar “as a consolation prize.” This creates good will with the crowd. Keep asking for other volunteers who can name ten. After that, offer $10 to anyone who can name all of the Ten Commandments, in order (very few can). That will get several people quoting the Commandments, making it easy for you to ask who has kept each one.
Then offer $20 to anyone who proves to be a good person. When taking someone through the Ten Commandments, appoint six people in the crowd to act as a jury (people are usually quick to judge the sins of others). That will help to engage the crowd, and it will take the heat off you. After giving the gospel it’s good to say, “Thanks for being a good sport. You didn’t prove to be a good person, so you don’t get the $20. But I have something else for you. Here’s $5 as a gift. You didn’t earn it, but I’m giving it to you because I care for you. That’s called ‘grace.’ God offers everlasting life as a gift to sinners, not because we earned it, but simply because of His amazing grace.” Have the person come forward to receive the $5, then explain that it wasn’t his until he received it. So it is with the gift of God.
And He wrote on the tablets according to the first writing, the Ten Commandments, which the Lord had spoken to you in the mountain from the midst of the fire in the day of the assembly; and the Lord gave them to me. (Deuteronomy 10:4)