I used to have a Huret Cyclometer, a simple non-computerized device that mounted on the fork, counted miles ridden and nothing else. It was a thrill to see it go from 9999.9 back to zero.
Somewhere along the line, I gave it away and eventually put a computer on my bike. After a season or two, I had to take the computer off. I was spending all my time obsessing about my speed, average speed, top speed, etc. and forgetting about enjoying the ride. Wish I had that old Cyclometer back.
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"Light it up, Popo." --Levi Leipheimer