The wheel was slipping in the dropouts (yeah, yeah, “fork ends”) after I changed a flat, so I added two links to the chain and cranked down extra hard. Two days later I noticed the end had cracked, but it still shifted.
Yesterday, at the bottom of the hill on Willis Road, it snapped entirely. The top two gears still worked, but the low gear only freewheels. I climbed the hill anyway, and picked about two gallons of blackberries for jam. Then I went to the Hotel Oregon and put my feet up.