The  Lake Wobegon effect comes from Garrison Keillors' A Prairie Home Companion show here at the Fitzgerald Theater.

Illusory superiority is a cognitive bias that causes people to overestimate their positive qualities and abilities and to underestimate their negative qualities, relative to others. This is evident in a variety of areas including intelligence, performance on tasks or tests, and the possession of desirable characteristics or personality traits. It is one of many positive illusions relating to the self, and is a phenomenon studied in social psychology.

• http://en.wikipedia.org/wiki/Illusory superiority