My favorite question to ask students and teachers is:
What do you notice?
I use it when I model lessons for teachers.
I use it when I am asking students about text.
I use it during a brain drainer [defocus to refocus] to reflect on a quote from Marianne Williamson.
I use it when I debrief with a teacher after a visit.
I use it with teachers when examining student work.
What is your favorite question to ask??
A bonus question: Instead of What do you do? I like to ask: What are you most passionate about? What gets you out of bed in the morning?