One day there was a fire in a wastebasket in the office of the Dean of Sciences. In rushed a physicist, a chemist, and a statistician. The physicist immediately starts to work on how much energy would have to be removed from the fire to stop the combustion. The chemist works on which reagent would have to be added to the fire to prevent oxidation. While they are doing this, the statistician is setting fires to all the other wastebaskets in the office. "What are you doing?" the others demand. The statistician replies, "Well, to solve the problem, you obviously need a larger sample size."

Quoted by Steve Simon, www.pmean.com, and attributed to Gary C. Ramseyer's First Internet Gallery of Statistics Jokes at www.ilstu.edu/~gcramsey/Gallery.html.