A few days ago I had run out of biscuits and decided to make cookies to my own recipe out of granola cereal. I put them in the oven and went into the sitting room and became engrossed in a film on Talking Pictures, called Houdini. When it finished I went into the kitchen to make a bedtime drink and discovered I had forgotten the cookies and there they were, looking just like coal.
I've got another 'keen'... Ouch!