"In one study led by social psychologist Lysann Damisch, half of the subjects were given a regular golf ball and the other half of them were given a "lucky" golf ball. The people with the "lucky" ball made 35 percent more putts than those with the regular ball. (The same researcher has found that people perform better on cognitive tests when they hold lucky charms.)"
How many of you would like to make 35% more putts? Guess what, it can all be in your head :p