..reading out the astrology page of a newspaper to a believer, who then went "Wow, that's *so* true!" ... except of course to this Taurus I read out the Aquarian horoscope...
I can't remember where I read it, but I believe a teacher once handed out an astrology passage to every student, suitably marked to their star sign. All the students went "ooh... true ... spooky". The teacher then asked the students to pass their piece of paper on to the person next to them - which is when the students found out that every single passage was the same.
Reminds me of a good book I read recently "Did Adam and Eve have Navels?" which I should probably do a review on or something.