Sometimes, dedication to the craft becomes just flat out crazy. For this list, we’re looking at actors who went to extremes to nail their character – be it gaining weight or something more extreme.Except for Jackie Chan, because that dude needs a list all to himself. Oh wait, he has one! Our countdown will include films such as "Good Time" (2017), "The Dark Knight" (2008) and "Philadelphia" (1993).What do YOU believe is the craziest thing an actor has ever done for a famous role? Let us know in the comments!