It could be anything: You went to check out a guitar and it was in such a trashed state, you got it for almost nothing, only to clean and fix it up to have a beauty. Or, you happen across one of those eBay ads that are misspelled or so poorly described that nobody finds them, except you. Or you happened by a guitar sitting in a garbage can. Etc. I had a recent experience along the lines of the first one: Guitar played horribly when I checked it out. After I cleaned it up and used a bit of DeoxIT on the pots, it turned into a stellar player.