Despite his somewhat disheveled look, Albert Einstein is one of the most brilliant minds of the 20th century. He won the Nobel Prize in Physics for his contribution to theoretical physics. Even most people can recite his famous equation, E=mc2 (though trying to explain it might be another story).
In The Big Bang Theory, Sheldon Cooper (Jim Parsons) has a genius IQ and photographic memory, though he spends most of those brain cycles on comic books, sci-fi, and sci-fi comic books. He himself enjoys costumes, even dressing up as Raggedy C3P-O one Halloween.