Don't throw darts at employees who don't engage in dart throwing. Don't be excessively loud. Don't drum on other people's desks.
On the flipside: don't get angry when people aren't enforcing library rules around you. Use headphones as a signal that you don't wish to be disturbed (and to block out noise, obviously.)
Well, I'm easily disturbed... If people start discussing something and laughing, I always end up too curious not to take my headphones off and participate...
Don't throw darts at employees who don't engage in dart throwing. Don't be excessively loud. Don't drum on other people's desks.
On the flipside: don't get angry when people aren't enforcing library rules around you. Use headphones as a signal that you don't wish to be disturbed (and to block out noise, obviously.)
Et cetera.