People are surprised by my shyness. Like constantly, I'm always hearing some variant of "You were loud like five minutes ago."

Depending on what kind of mood I was in when we first met people are surprised by how stupid or intelligent I can get.

Also I'm always surprising my friends by how much energy I have.

On a less positive note, people are always surprised by my bad mood when I'm wet. I don't like being wet and everyone learns that the hard way.