I can use this regularly:) 

Which points do you find most useful?

1. Keep calm. Don’t turn it into Godzilla vs. Rodan. (Samurai secrets of staying calm are here.)
2. Treat’em like a child. You can’t talk them out of emotional outbursts and getting angry over it does nothing good.
3. Say “Please speak more slowly. I’d like to help.” Slow it down. Don’t come off like you’re fighting back.
4. Ask “What would you like me to do?” You gotta make’em start thinking in order turn off the rage machine.
5. Don’t make statements. Ask questions. Explaining is veiled dominance. Questions get them thinking.
6. Start sentences with “I’d like…” not “You are…” If you start with “I” it’s hard to be seen as attacking.
7. Let them have the last word. Don’t let your ego blow it at the last minute.

So what does Al say is the single most important thing to do when dealing with people?

When they speak, ask yourself why they’re saying what they’re saying. Think about what’s going on in their head, not yours. This leads away from judging and toward understanding and compassion.