Ask HN: What are some good interview questions to gauge the "culture" at a job?

A while back there was a great thread or comment on this exact question but I've searched and scoured my bookmarks to no avail.

So, I guess I'll make my own thread!

What are some good questions to ask in a job interview to make sure you're not gonna have a bad boss?

What about to make sure the company isn't a nightmare work environment where you'll be putting out fires all the time?

Questions to ask to see if you'll realistically be promoted, things like that...