A californian, theoretical physicist, and London PR agent walk into a science museum. The californian asks the theoretical physicist a vague philosophical question and the PR agent publishes it. "Win your own trip to London my friends and this too could be you!"
The punchline? Slashdotters think stephen should stfu. Imagine winning a trip to London, getting to meet stephen hawking, and you decide to have some camp-fire-bullshit talk while touring a museum and all he does is say, "sorry, I'm just a theoretical physicist and am thoroughly incapable of making small talk", or worse, starring you down with no response.