At one time the answer seemed to be inexplicable, lost in the unfathomable mysteries of the human psyche. But we can now see that the answer may hinge on something far simpler: an evolved capacity to experience anticlimax faster, sharper, and deeper than the rest of us. After all, anticlimax is something we have all experienced, but it is striking just how quickly top performers come down to earth after winning a major title; remarkable how rapidly they emotionally disengage from a goal they may have spent years striving for.