Riding single bike yesterday through 6 mile long construction zone.
Got a flat on rear wheel from a cactus thorn. Put in spare tube, pumped it up, but no luck as the valve stem separated from the tube.
Pulled out the tire I flatted and sat on the roadside to patch it; all went well until I tried putting glue on the holy tube . . . all the glue had dried up!
So, stuck out my thumb. Fortunately got a lift from a fellow bike rider that drove a jeep with a rack on the rear.
Guess all was not bad luck!