Just off the top of my head the one I always remember looking back is when they were in the jail (not the little jail in the garden) but when the poor side were convicts, all locked up. And then they found the secret tunnel and tunneled through to luxury, and had to come back to the jail at the end of each day so the guards wouldn't know. Good twist.

And also, nearly as good, when they had the horrible task in the individual cells and only Maxwell was actually working!