I'll bite, 31seconds. What's the cigarette lighter for.
For what's it worth, I also carry a few packaged alcohol swabs. Cheap, take virtually no space, and sure make it easier to patch a tube after washing of the talcum powder. Honestly, though, I would much rather use the spare tube than patch while squatting in the dirt, with wind blowing dust on my freshly laid coat of glue. Maybe that's why some people carry glueless patches. I don't.
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Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.