Geeks you love to hate

A quick overview of a few geeks (every field has there share of geeks in my opinion) that people love to hate. For our purposes we will work with the following definition of geek:

A person with a devotion to something in a way that places him or her outside the mainstream. This could be due to the intensity, depth, or subject of their interest. This definition is very broad but because many of these interests have mainstream endorsement and acceptance, the inclusion of some genres as "geeky" is heavily debated. Persons have been labeled as or chosen to identify as physics geeks, mathematics geeks, engineering geeks, sci-fi geeks, computer geeks, various science geeks, movie and film geeks (cinephile), comic book geeks, theatre geeks, history geeks, music geeks, art geeks, philosophy geeks, literature geeks, historical reenactment geeks and roleplay geeks.