What are some things that everyone does when they've lived in the Bay Area for a long time, but transplants don't know about?

I'm moving to the Bay Area this summer for a super exciting career opportunity. I've spent my whole life living on the East Coast and in the Midwest. We have our own versions of some things transplants might not know (it's ok to use a chair or traffic cone to save a parking space you've shoveled out after a snow storm, for example) and I'm wondering what I should know about the Bay Area. I recently learned that many people in earthquake-prone areas don't frame things on the wall above their beds. What else am I missing??