I offer these things that have either mostly served me well, or, I have learned painfully.
1) Never judge people by their appearance.
2) Always judge people by their bumper stickers, or lack thereof.
3) Anyone driving in the passing lane who is not speeding is an a**hole to be avoided at all costs.
4) Don’t dis slow people. One day you’ll be one, probably quicker than you’d think.
5) If something really smells bad, change direction. In a restaurant, on a trail, or in a relationship, leave the immediate area of the stench. If the smell stays with you, it’s you.
6) Never judge a forum member by their online persona, especially me. (Unless it’s Tallgas) Just kidding. He’s probably alright. Maybe…maybe not. Probably not. Really Gassy, I’m kidding. Seriously, I might be a dick, but every forum member I’ve met has been pretty cool.
7) When a door (opportunity) opens, step through it quickly because it usually slams shut in your face if you don’t. This includes climbing something difficult with your betters, even if you wonder if you’re capable. Hike as often as you can because your health is only a given until it’s not. And that could be tomorrow.

9) If someone asks you directions and you’re not sure, don’t make something up to look helpful.
10) Never count on Gerry Roach’s trailhead directions to get you to one, at least in a timely manner. Which is just fine, per #8 above. I’ve met some fun peeps, while trying unsuccessfully to find a TH from his directions. Maybe that’s his plan.
11) LOOK FOR CHEAP AIRFARES TO PLACES YOU’VE NEVER BEEN. No explanation necessary here. DO IT.
What are your ideas that I can add to my list?