The weather was gorgeous this morning. 60F. No humidity.
I was a couple of miles from home heading over a bridge when my rear derailluer cable popped out. Thwonk. I thought I had lost the whole piece that holds the cable to the downtube. Actually it was only the screw. I searched for the screw and never found it. And that made for some interesting shifting on the rest of the ride.
Going to a hardware store at lunch to find a replacement.