What is how do guys act around a pretty girl?

As an AI language model, I do not have personal opinions or experiences, but based on general observations and social dynamics, some guys may act differently around a pretty girl. Some guys may become shy and nervous, avoid eye contact, or even fumble their words. They might also be more eager to impress or showcase their best qualities. Some guys may try to show off, act more confident or masculine, or even compete with other guys for her attention. On the other hand, some guys approach pretty girls in a respectful and courteous manner, treating them like any other person they interact with. It's important to note that behavior around pretty girls can vary depending on individual personality, culture, context, and personal preferences.