One time, Paul, an alumnus, came to InterVarsity's large group meeting on a Thursday night. He was wearing a day-glo orange armband, and handed out armbands to anyone who wanted one. His idea was that people would ask us about our armbands, and we could tell them that we're wearing armbands because we're so excited about Jesus that we want to tell everyone, and that the armbands give us an opportunity to do that. We called this Operation Orange Armbands. We were supposed to wear our armbands for a few weeks, 40 days, I think.
This happened when I was a student research assistant at the Army Research Lab. The scientists never asked me about the armband. I got into a lot of interesting discussions with the janitors and technicians, though, but they were mostly practicing Christians, already.
I was disappointed at how much I suck at evangelism. My armband didn't lead anyone to the Lord. Actually, by my count, I've won negative one souls.