Much of day-to-day life involves the knowledge (and practice) of unspoken rules. For example, here in New York, you should not be putting a bag on a subway seat - and you should definitely let people get off the subway before you get on. They may seem like universal forms of etiquette , but more people seem to ignore them than we think. Recently, redditor u/HAXposed asked the site's users to share the unspoken rules that, when broken, annoy them the most. And it's sad but validating to see that…

Meanwhile, in Boston:

The book stroller really helps with shoulder pain.

The etiquette of life is pretty different when you’re in the air, full of rules that do everything from stopping people being jerks to preventing the plane from doing a nosedive. If you’ve half-watched the cabin crew do the safety demonstration enough times, one of these that is probably burned into your brain is a variation on the words “ smoking is not permitted on this flight”. However, this doesn’t always mean that people pay attention to it. While it may seem like an obvious rule that appl…

"We have rules."

Do not mess with them.