Sherlock and Watson were going camping. They pitched their tent under the stars and went to sleep. Sometime in the middle of the night Sherlock woke Watson up and asked, "Watson, look up at the sky. Why do you see?"

Watson replied, "I see millions and millions of stars."

Sherlock said, "And what do you deduce that to?"

Watson replied, "Well, if there are millions of stars, and if even a few of them are planets, it's quite likely that there are some planets like Earth right there. An if there are a few planets like Earth out there there must be life.

Sherlock replied, "No, Watson you idiot! It means someone stole our tent!!!"