Today (Easter Sunday) was Big Wheel Race Day on Potrero Hill in San Francisco. By my estimate several thousand big wheelers careened down the crookedest street in San Francisco, cheered on by (my estimate) thousands of laughing and screeming women, children, men, clowns, elves, fairies, puppets, dogs, no cats. The rules appear to be: You start at the top, you ride, or fall, or tumble, or run, or drag your Big Wheels to the bottom. If you stop you'll probably get run over. Do not go up. Do not get off the course into the crowd. You and as much of your Big Wheel as you can find must complete the course (together). When you get to the bottom, you can go again, if you and your Big Wheeler can make it back up the arduous dirt path on the side of the hill. The hill has a very old concrete roadway and walls, and riders take a thundering serpentine 8 curves down, starting from about 100' above where they end up. The road was built to shed rain off the sides instead of a raging river running down the street, so the banking is just opposite of what you'd want for racing. Wheels fall off, fenders fall off, riders fall off, handlebars fall off. Crashes occur, pileups occur, tangles occur, spinouts of all kinds, occasionally into the crowd. Riders ride on, sit on, lie on, push, carry, run along side of, leash their kid on, reassemble, disassemble, discard, and sand the bottom off of their conveyances, everything from the real BW to spindly racing versions to tricycles to wagons Two ...