Answer:
What happens when you throw a green stone into the Red Sea?
What has keys but no locks a space but no room and you can enter but can't go in?
I have a mouth on my head and eat everything.
I have more shoes than anybody but less feet than everyone. I am met in the morning but departed in the night. I may shake as if I'm angry but I won't bite.
I can be written, I can be spoken, I can be exposed, I can be broken. What am I?
The answer I give is yes, but what I mean is no. What was the question?