Sherlock Holmes and Dr. Watson are going camping.
They pitch their tent under the stars 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 replies: ''Watson, you idiot, somebody stole our tent!''