Don’t piss of animals, no mater how cute and harmless they seem to be, and don’t think they won’t bite just because the owner said so. Every animal is dangerous, from elephants to ladybugs. The only reason they didn’t do you any harm was because you didn’t scare them or piss them off. It goes for the water animals too, and humans.
If you are listening to the music in the bus, (or anywhere public) put your headphones on. No one gives a shit about your deafening noise. (If you are listening to the radio on your phone, always check that the speaker isn’t turned on. You wouldn’t like people looking at you and chuckling). Also, don’t blast music from your car. You look like a douche, no one sees someone with windows rolled down, blasting music and think “Wow, so cool!”.
Make up your mind about what you want to buy before you come to the store. Don’t waste other people’s time. And wear your own bag, especially if you buy a lot of things.
Be nice to clerks, janitors, etc. Their lives are already shitty enough if they are paid to serve you, don’t make it worse. And you don’t want them refuse to help you. In fact, be nice to everyone, random strangers are not your targets to channel your frustrations on.
Everything else above goes too.