I had a flat on the way to work today. Not really earth shattering, it was about 5 miles in, only a short walk until the office, where I could fix it in comfort.
But walking the bike, I noticed an odd behaviour. The flat was on the front wheel, and I noticed that once per revolution, the handlebars would turn slightly to the left. Very consistent, just as the valve would get to the bottom of the wheel.
What would cause this? Is it just the valve being slightly thicker than the (now deflated) tube, or did I somehow damage my rim in the short while between the puncture and me stopping the bike?