There is some evidence that share prices undershoot fair value in the short term (as investors are slow to react to individual pieces of good or bad news) but over-react in the medium term (extrapolating present trends, like Buzz Lightyear, to infinityandbeyond).
Sure, he felt pretty awful when Andy demoted him from top toy in favor of Buzz Lightyear, that way-cool spaceman who liked to shout "To infinity, andbeyond!"