You don't even need the Ipod--just get the headphones/set, pin the end that would plug into your Ipod in a pocket, and pretend to be listening to something. I used to do that on airplanes when you still got the headset--I'd put that on and pretend to be listening to music...
That's kind of the reverse thing I do when I realized so many people shopping were talking on their phones. I don't worry about looking weird when I talk out loud to myself!