This is one way to do evangelism...
So how do you "talk about Jesus?"
I love what the Apostle Paul says in I Corinthians 1:17:
"For Christ did not send me to baptize, but to preach the gospel, not in cleverness of speech, so that the cross of Christ would not be made void,"
Preaching the gospel is simply declaring the good news of Jesus Christ and we are all called to do so, not just the professional Christians! Everyone should be sharing God's story and doing so in the most simplest way possible.
Though, it might be a good idea to leave the guns at home with grandma!