call 1000 people today, tell 500 of them football team A is going to win this week. call the other 500 people, tell them that football team A is going to lose t

call 1000 people today, tell 500 of them football team A is going to win this week. call the other 500 people, tell them that football team A is going to lose this week. Football Team A wins. Next week call 250 of the people that you told team A would win this week, tell them football team A will win again. Call the other 250 and tell them that football team A will lose. by the end of the season you'll have a dozen or so (i think?) people that will believe anything that you tell them [if anyone can tell me the source of this idea (book/movie?) let me know!]