I was on a lovely ride today, the second day of a tour of southeast Massachusetts. We were heading out of New Bedford, going southwest through Dartmouth and then Westport, overlooking Buzzard's Bay, when this object imbedded itself in my rear tire/tube:
Upon extraction once I was back home this evening, I discovered it well fit the nautical area through which we were riding:
My front tire was also losing air, and I needed to pump it up a couple of times with five miles to go, but I made it home without changing it out. I'll wait until tomorrow to see what sort of object caused that one. It was my first double-flat day in a very long time.