Check out this video! (hat tip to Onegoodmove) You might think about rare happenstances a little differently after getting a good shot of statistics in your brain.
Think about all the ways that in fact common and likely events are used by people to convince you that some X factor was responsible for it. X could be a supplement pill, a supernatural claim, or a skin care product. It takes a carefully designed test to really know if X causes Y. Otherwise, it could just be coincidence.