It was all a dream

Mrs. Todds my English teacher gives an automatic "F" if anyone ever writes "I woke up and it was all a dream" at the end of a story. She says it violates the deal between reader and writer; that it's a cop-out, it's the Boy Who Cried Wolf. But every single morning we really do wake up and it really was all a dream.

— from Slade House, by David Mitchell.