1) When boarding an airplane, put your coat and your backpack/purse under the seat in front of you. If you put those items in the overhead compartment, onlookers will think you're an a-hole.
2) Stay to the right when driving on the highway - unless you're passing. If you park yourself in the left lane, other drivers will think you're an a-hole. This rule also applies to escalators.
Thank you for your time. Go Packers!
San Francisco, CA