Iron Man's story is a classic example of a superhero finding his edge. Before his kidnapping by an Afghan terrorist group, Tony Stark is a hard-drinking playboy with not a care in the world. When a fragment of shrapnel embeds itself in his heart, Stark realizes that he needs to get his act together if he's going to live to seduce another starlet. This inspires the construction of the first Iron Man suit and Stark's decision to get out of weapons manufacturing. Sort of a "come to Jesus" moment, you would say.