It was relatively easy to write 'The Cave of Lost Souls', though, because it came to me one night in a dream. I remember waking up and having this idea for a complete story - from start to finish - in my head, so I jotted it down, then later began writing the thing.
“When I was a little kid, I wrote this play about all these characters living in a haunted house. There was a witch who lived there, and a mummy. When they were all hassling him, this guy who bought the house - I can't believe I remember this - he said to them, 'Who's paying the mortgage on this haun”