Asskickers Syndrome
The condition of having such unrealistically high expectations of one's self that anything less than excellence is disappointing. Those with A.K.S. gravitate toward opportunities for achievement to the point of neglecting everyday life. Symptoms include violent mood swings, sore losing, sore winning, and few close relationships.
Larry seems like a nice guy, but he's got a major case of Asskickers Syndrome. Don't challenge him to any competition; he turns into a different person.