Our intrepid pair decide to spend a couple of nights in the open. Holmes wakes Watson from a sound sleep.
"Watson, looking up, there is not a cloud in the sky. I can see the Plough and numerous other constellations. What does that tell you?"
"Well Holmes, as you well know a star is, in fact, a sun. So if there are about three million stars out there, each star represents a galaxy with it's own network of planets and moons. It seems inconceivable that we are th only planet with any life on. I have thought of the matter in ernest and I am of firm belief that there must be life on other planets! What about you, Holmes?"
"Very interesting, Watson. My observations are rather more down to earth though."
"Oh, what's that, Holmes?"
I deduce that if we can see three million stars in the night sky, it tells me one thing."
"Which is?"
"Somebody has stolen our tent!" ROTF!