Learn something: How etiquette works
There seem to be two kinds of etiquette: that which is useful, and that which is not. The former provides social lubrication that helps everyone to get along in less-than-ideal situations.
Perfect example of useful etiquette - 300 people packed in an aluminum tube for several hours with no hope of escape until arrival:
Airplane etiquette 101 - A flight attendant offers a refresher course on common courtesy
New York is so dense that it has its own rules, but many apply in any urban setting:
We were going to take the kids eagle-watching, but after learning something about eagle etiquette, thought we might wait a couple years:
Program to teach ‘eagle etiquette’ - Of note: “In fact, walking within 350 feet of these birds may cause them to abandon their nest, likely dooming their babies.” See also: Eagle Etiquette
Golf actually has a pretty evolved set of social rules in order to keep things moving along, so there is:
And then there are table manners, to avoid grossing other people out:
Table Manner Tips Every Guy Should Know. See also: Expert offers etiquette advice for professional settings.
Bonus: Male restroom etiquette:
The essential message here: never speak in a male restroom, or society will collapse.
How not to be an asshole or encourage assholism on the internet: a handy guide