What are your team's ground rules for people, meetings, standups, and more?

I am aggregating many ground rules for programmers and technical teams. https://github.com/joelparkerhenderson/ground_rules The big idea is that ground rules help everyone work better together and have better understandings. I believe in the Google "be nice" teamwork ideas. Here's my list so far... ideas and feedback are very welcome. What are your team's ground rules, and how are they working for you?