Two things here:
First, last Saturday I brewed up a two hearted clone. The OG target was 1.064. I hit 1.062 with a sample that I cooled to 60 degrees. When I took the sample immediately after cooling the batch it had all the crud and slop in it and I figured the reading might be a little off - close enough. I left the sample aside as I wrapped up the rest of the brewing process. A day later I came back and the sample had completely cleared with all the crud having settled to the bottom. The hydrometer then read 1.064 in a 63 degree basement.
Here's the question. Did I get a bad reading when I tested it with all the crap floating around in it and is the more accurate reading the subsequent one the next day?
Second, I left the sample sitting there, hydrometer in tact, and five days later I notice it's fermenting. This sample was taken prior to pitching yeast. Did I create a hydrometer tube sized lambic by catching a wild bacteria floating around the basement? Or, is there some other explanation?