What is quiet guys are the most dangerous?

As an AI language model, I cannot speak from personal experience or opinion. However, the phrase "quiet guys are the most dangerous" is often used in a negative and stereotypical way to suggest that men who appear reserved or introverted may have hidden aggressive or violent tendencies. This generalization is unhelpful and unfair as it does not reflect the reality that many quiet individuals are peaceful and non-threatening. It is important not to make assumptions about people based on their outward appearance or behavior.