Bungee cord to the rescue!
There I was riding along, trying to hurry and suddenly there was the sound of my rear fender rubbing against the tire. The rear rack had come undone! Someone
, namely me, hadn't tightened up the fasteners or checked them after removing the rack and reinstalling it about a month ago. Some of the fasteners are lying on the road somewhere between home and work or if I'm really lucky they're on the floor of garage. Luckily I had one bungee cord in my trunk bag and was able to loop and hook it so that the rack was back in position. The whole adventure only added about 5 minutes to my commute.
Lesson learned: Periodically check the rack mounts for tightness.
2005 Specialized Dolce - Stock body geometry saddle
2005 Novara Fusion - Terry Liberator Y saddle
Dahon Ciao! / stock saddle