This puzzle is from my friend whom I'll call Arthur (I don't know why, but he gave me this from a book). As this was a long puzzle, he wrote it on a page for me. The puzzle was:
Mr. Adam looked up from a book he was reading on famous dreams and said to his wife: "Dear, listen to this story! It's really quite amazing!"
The story he told to his wife is:
Boston, Mass., April 1, 1903. Mr. K--- had the following dream. Having gone to bed after reading a book about King Arthur's Court, Mr. K dreamt that he was fighting in a joust against the dreaded Black Night. He had been thrown from his horse, and as he lay dazed upon the ground, the Black Night came thundering towards him with his lance aimed straight at Mr. K---'s middle. At this point, his wife woke up, and seeing her husband was having a nightmare, she poked him in the stomach in an attempt to wake him up. At this, her husband screamed in his sleep, clutched his stomach, and fell back onto the bed dead of a heart attack."
The story ends here. Now Mr. Adams is talking to his wife.
"All I can say, Martha, is never wake me up in the middle of a nightmare," finished Mr. Adams.
"That's quite a tale, all right, Amos" replied Martha, "but I don't believe a word of it. Any fool can see that that's a made-up story."
How did Martha know that the story was a phony?