My favorite anecdote about astrology was told by a college teacher. At the start of every semester's new class, the professor would tell the class that he had charted each person's horoscope and he had typed out each individual description for them. Each student was then called out and given their reading on a folded piece of paper. They were instructed to read it to themselves, let no one else see it and they were not to discuss it with anyone.
After everyone had finished reading their individual descriptions, they were each asked how true they thought their horoscopes were of them personally, irrespective of their belief in astrology. Every year, an overwhelming majority think that the horoscopes were surprisingly very accurate. The group is then told to hand their individual descriptions over to the person sitting immediately on their right. There is always a burst of laughter as they read each other's descriptions, because they realize that all of the descriptions are identical.