Here is an unusual evangelism tip that Greg S. suggested, taken from the Adventures in Christianity website.

I was at the airport (where I work) yesterday and I saw a huge group of Japanese tourists, and some Muslims all decked out in their Mohammad outfits. Well, if you go up to them and start sharing Christ they will ask the security to get rid of you quickly, but what I do is just pick up my cell phone and put it up to my ear and let her rip for Jesus!
I can preach to my heart’s content if they think I am talking to someone on my phone; they have never yet complained or even let out a peep of protest. If you want to really cover yourself you could call a buddy and tell them what is going on. Or you could call someone you know who needs the Lord and get two jobs done at once! At any rate, I have really enjoyed cell phone preaching lately… [It’s a great way to avoid security problems when] we can’t preach in these private property venues. With a cell phone in hand, you can preach wherever and whenever you want! Read about another similar tip called “Speak Loud” here!