Sherlock Holmes and Dr. Watson go camping
They pitch their tent under the stars and go to sleep. In the middle of the night Sherlock wakes up Watson and says: “Watson, look up at the stars, and tell me what you see.” Watson replies with: “I see millions and millions of stars.” Holmes says: “And what do you deduce from that?” Watson thinks for a minute before responding: “Well, if there are millions of stars, and if even a few of those have planets, it’s quite likely there are some planets like earth out there. And if there are a few planets like earth out there, there might also be life.” Holmes looks at Watson before responding: “No you idiot, it means somebody stole our tent.”