Riddle: Sherlock Holmes and Doctor Watson were going on a hike through the woods. After a long day of hiking, they stopped for the night. They ate a cold meal, pitched a tent, and went to sleep. Both of them woke up in the middle of the night. "The stars are out tonight," remarked Doctor Watson. "What does this tell you?" Sherlock asked. "Well," he replied, "By the positions of the stars, it's roughly midnight." "What else does this tell you?" Sherlock asked again. "I don't know!" Doctor Watson retorted, annoyed. "What does it tell you?" What did the detective notice?
Answer: "Elementary, my dear Watson. Someone has stolen our tent."