Thanks to BoingBoing for this example of the importance of skepticism:
A gang of thieves in Istanbul, Turkey have reportedly been dressing like doctors and distributing sedatives door to door, telling residents the medicine was related to a test for high blood pressure. Once the victims dosed, the thieves would rob them. As part of the police investigation, officers attempted the same trick but used placebos. Apparently 86 out of 100 people who answered the door took the pill right away. Police then attempted to explain why that was a bad idea. From Reuters:
Turkish police in other provinces have also used novel methods to test citizens’ gullibility.
Officers in Adana in southern Turkey last week called at houses, announcing through the intercom: “I am a burglar, please open the door.” Police said they were stunned at the number of people who opened the door, the Radikal daily newspaper reported.
Maybe this explains why people swallow the wild tales of birthers.