Doesn't everyone try to pick up every skill that might be useful in a disaster situation, given the slightest opportunity?
I've helped built houses, I've done plumbing and electricity - I can build a generator, but I forgot how to build a radio - I've done basic car mechanics work. This is just from things I needed to do while helping out, or because I didn't have time or money (or could be bothered) to hire someone to do it for me. To me it seems like most people with a brain could pick up that quickly, maybe not be good at it at once, but still.
I'm training Aikido and medieval swordfighting. That might be useful, but I really hope not.
I can't lift heavy things, due to a disc that doesn't want to stay put. That is not so good.
My current profession is embedded programmer/software architect. That will be utterly useless, I think.
But, in the end, I think the most useful skill I might try to use is to get people together to help each other.
(For something interesting on the line of what you can do with very little at hand, I recommend the BBC/Open University series Rough Science, especially the first season.)