I had the same thing happen on my old Ford, spent an entire Saturday chasing a no-start condition that turned out to be a broken wire inside the insulation about three inches from the connector. You could tug on it and the light would flicker, but it looked fine with just a visual check. After I finally found it and soldered in a new piece, the truck fired right up and I felt like an idiot for not checking that spot sooner.

I helped a friend fix a busted zipper on a tent once using dental floss and it held for about two more trips before it gave out entirely. How many times have you actually had that floss repair hold up for a full season without resorting to a full zipper replacement? I'm curious because I've never gotten more than three or four uses out of it before the stitches started pulling loose.