Have you seen that commercial for a Dutch Boy paint that apparently eliminates odors? The commercial claims that 64% of people fail to notice odors in their own home. If you look at the fine print on the commercial, you'll find the source of that statistic: Dutch Boy Paints.
I'm a little curious first about the method Dutch Boy used to determine this. Did they send in a group of people to smell a house, have that group arrive at a (somewhat subjective) consensus about the nature of the odor, then ask the owner of the house whether he/she smells anything? I'm also a little suspicious of the 64% number since, oh, that works out to 16 out of 25 people. Could Dutch Boy provide some more data on how they arrived at this number? Exactly how large was the sample size?
Either way, to sell paint, Dutch Boy cites a statistic, then cites itself as the source of that statistic. Well done.