I think Don Quixote had a very contagious personallity. The story said that he was so charming at times that the innkeepers, who he considered and treated as princesses knew that he was crazy but had a good time and played along anyway for his sake. I believe he also had a positive impact on Sancho, his squire. At some points throughout the story Sancho legitimately believed Quixote and the crazy adventures that they emabarked on together.