On the way home last night I stopped at the LBS to pick up a wheel I'd left for truing. (I had a small incident on the Saturday group ride and my front wheel got all tweaked.) I bungied it on top of my rack and rode home. When I pulled into the driveway my neighbor said "Do you always carry a spare wheel with you like that?" I hadn't realized how funny it looked: kind of like a bicycling version of a Lincoln Continental.