Watch the front wheel of that stopped car that could pull out in front of you. You'll see it turn much sooner than you'll notice the entire car move. I don't make eye contact (it's not reliable). Watch the wheel. Best tip I've ever learned.
I'd rather have light in my eyes, than theirs. Not really a rule...
Waving is optional, sure, but if you assess the brand of my bike in order to determine if you'll respond, you're a dick, most likely, in all aspects of your life. I'm pretty sure that's one of the laws of the universe.
Edit: #5). See a Rider in Need? Stop...... Yeah, I could have used that one this past weekend.