It happened when I was about five. My uncle and I were out picking blueberries in a wooded area. I was about 50 feet back from where he was in the trail, and I could see him in the sunlight doing a sort of rotational movement with each of wrists. In fear, I ran the opposite direction, spilling almost all of the berries I had in the bucket. When he jumped in front of me from the point he was originally at, he just stopped and laughed. I realized then he was simply doing the wrist thing to celebrate more so than sadness,etc. I laughed and laughed at myself for being so foolish.