I just got off the phone with my youngest son. He was telling me about a book he was reading on cycle racing. He said that the one description he liked the best was that riding was like a very smooth ball bearing going around and around in your head. So, for him it explained why he thought about weird subjects, ran old song lyrics through his head over and over, and sometimes just counted pedal strokes, or got into counting a rhythm of strokes (1,2,3,4,5,6,7,8, - 1,2,3,4,5,6,7,8, - 1,2,3,....). So, now I'm thinking - the poor kid. He didn't fall quite far enough away from the tree.