If you wear a dorky hat, you might be interviewed on live TV by the local news because no one else has a sense of humor in those things! Not that I know....
.. just kidding. I do know - for the last marathon that my step-mom, her neice, and I walked we wore these dork hats. Mine was a headband with a giant butterfly on it, Kathee's had some birthday candles on it, and her neice had a princess hat with the words "Happy Birthday!" on it because it was her birthday.
Remind me to put the clip up. My dad taped it and burned it onto a DVD for me and it's absolutely hillarious.