Wearing a Strange Hat.
This challenge is harder than it may seem, but a lot of things can be learned from the exercise.
Find a strange hat, something different, not a baseball cap or something you commonly see, but something a little unusual to your daily surroundings, a bowler hat, top hat, etc.
Wear the hat. That's it, that's the entire exercise, just wear the strange hat, wherever you go, whatever you do, wear the hat.
Watch people's reactions to it, how they respond to it, how they respond to you for wearing it. You will learn a lot from the experience, it's far more difficult than it seems.
People will ridicule you, they'll demand you take it off, or tell you that you can't wear it when they're with you. They'll ask you a million questions about why you wear it, and give you a million reasons why you shouldn't.
Wear the hat.