We specifically designed this icebreaking exercise to facilitate "cold witnessing" with strangers. We discovered that cold witnessing is a last resort because witnessing to someone with whom you already have a relationship is much more effective. We call this primary type of witnessing "oikos mining." This activity is especially beneficial when interacting with a group rather than working one-on-one. A real challenge sometimes. It seems especially good with pre-teenage and teenage boys or young men.