In the middle of dinner during chapter 3, Don Quixote realizes that he has not been properly knighted. He begs the innkeeper to do him the honor. The innkeeper notes Don Quixote's madness but agrees...
Don Quixote became insane because he read so many books of chivalry and so his mind changed to a more chivalric manner and that changed his whole world.
An old man that is about 50, he starts reading knight books then starts thinking he's a knight. He begins doing things like a knight. He fixed his helmet with cardboard and thought his horse was big...