Since the beginning of time, man has needed another man — as a confidant, as a teacher, as a friend, or sometimes more. Since the beginning of the cinema, men have similarly leaned upon each other — whether they're teaming up to do something extraordinary, beating each other to a bloody pulp, or simply stepping into the age-old roles of goofball and straight man. Now, with Paul Rudd and Jason Segel teaming up in theaters to say "I Love You, Man," we present a brief history of the bromance: