Sherlock Holmes and Dr. Watson are going camping. They pitch their tent under the starts and go to sleep. Sometime in the middle of the night, Holmes wakes Watson up:
"Watson, look up at the stars, and tell me what you deduce."
Watson says,
"I see millions of stars and even if a few of those have planets, it's quite likely there are some planets like Earth, and if there are a few planets like Earth out there, there might also be life." Holmes replied:
"Watson, you idiot, somebody stole our tent."