Ear-bud and Headphone Etiquette 101

I have too many ear-buds. How many do you have?  They are everywhere. The subway, bus, jogging, walking, gym, at work, restaurants, so on and so on. It is time to lay down some ground rules and regulate how they should be used.

1. Take the ear-buds out. Completely out when engaged in a conversation. The assurance that the device is off or turned down is inadequate. Keeping the ear-buds in is saying very clearly that you are not interested in what I have to say. 
2. Don't share ear-buds. That's filthy. The ear may have a waxy build up, eewwww, or collect microscopic debris and particles from you just being outside. I bet you feel like cleaning your ear right now. Point is, don't share the contents of your ear canal with anyone.
3. Take your ear-buds out or turn your device all the way down when you are in a public space where there is the likelihood of a Public Service Announcement (PSA). You risk missing the important announcement that your train will not stop at this station due to switching problems.  You also risk Me ignoring You when you finally take them out to ask why your train zoomed past the platform.
4. Ear-buds are personal speakers. The intended purpose is that you can enjoy your own music in your personal space. The rest of us don't care to hear what you are playing. The rest of us can actually see, and now hear, that you are either deaf or ghetto. Rarely do you hear Beethoven Symphony No. 9 blasting from ear-buds or headphones.
5. Do not use ear-buds when walking around your office. It's bad enough that you feel the need to use them at your desk. If you are in a professional/work environment you must leave yourself open to interacting with your colleagues. Do not risk your boss having the impression that you are ignoring her when you failed to respond after she tries to get your attention.

Do you have an ear-bud headphone pet peeve to add?