I like to snag whatever opportunity I can to get more than one thing done at once, and lunch break is a great time to do that! Check out the witnessing videos on www.livingwaters.com (Media>Video>Living Waters University or click here). I've found them to be really helpful, diverse and instructive as I learn how to share my faith with others.
Note: Throughout these posts, you'll find I've linked or referenced to various ministries, blogs, or other websites. Although I have found helpful resources from each, I do not mean to imply full endorsement of them, their teaching, or their material.