Listening To Music without Headphones
Even if you have perfect musical taste, no one wants an uninvited performance from your iPhone. Unfortunately, not all Americans have received this message. No one is as interested in what you’re listening to as you are.
Littering
We have no qualms about polluting our own country, so what makes you think we’d be concerned while we’re not at home? If you absolutely must litter, put it in your suitcase and throw it out the window on the way home from the airport.