Do not play music
without headphones on.
Please.
Keep a check on your language. Whilst bad language doesn't really bother me, and I am not going to be remotely fussed by the odd swearword, nevertheless a steady, loud stream of constant profanity (not to mention vulgarity) is not at all pleasant for other people to listen to.
If you have a child with you, don't allow them to press the bell
repeatedly. Once is enough: it's not a toy. (Most people with children who let them press the bell are actually really good about this, and I realise that sometimes kids
will manage to sneak in an extra couple of prods against one's best efforts, but I'm talking about those who indulgently
allow the constant ding-ding-ding, and those who even
encourage it.)
It is not cute to sit in the luggage rack
when there are seats available. (You shouldn't really do it at all, but someone perched on there when the bus is chock-full doesn't bother me - so long as they shift if another passenger wants to put
luggage there.)
You'd think all these would go without saying, wouldn't you?

(Hrumph. I was up at the local school
again this morning to complain about a solid twenty minutes of screamed [yes, full-volume, top-of-the-lungs
screamed] vulgarity and profanity from certain of their pupils on the [public] bus I catch for work, and am therefore feeling a little raw about the subject.

)