If you're in a vehicle going at the speed of light, what happens when you turn on the headlights? How does the bloke who drives the snowplough get to work in the mornings? Have you ever imagined a world with no hypothetical situations? Why isn't phonetic spelled the way it sounds? Has a fish got a watertight head? If it is open 24 hours a day, 365 days a year, why are there locks on the doors? If you try to fail and succeed, which have you done? What colour is a mirror? If a man is talking in the forest and there is no woman there to hear him, is he still wrong?