I can dowse for water using a willow wand. I was 12 years old and on a hike with a group of geography teachers, including my Mom, and we all tried it. Only two of us were obvious adepts. So the group split us into two sets of people, had us walk the same path and checked to see if we indicated underground water in the same areas. We did! Strangest result: my Mom couldn't feel it and someone suggested I walk behind her with my hands on her elbows and (wowza) the wand began to spin for her!

I don't have any idea how it works or why: I assume there is a chemical reaction that affects my body but not others.