Back in the day when we dove with grouper almost as big as us there was one guy who kept "bumping (spelled with a B) me. At first I thought it was a diver, unaware that I was above him. After the third bump I turned, angrily, only to find this grouper guy. I chased him off and he promptly went over to my daughter and started bumping her. At this point he had a buddy following along watching like he was taking lessons. I actually have this on video; very funny.