Talk about "ask a silly question"...
How do you get the "Keep off the Grass" sign on the grass?
How do you get off a non-stop flight?
How do you know when you've run out of invisible ink?
How do you throw away a garbage can?
How does the guy who drives the snowplough get to work in the mornings?
How much wood could a woodchuck chuck if a woodchuck could chuck wood? (Does he employ a splinter group?)
If a jogger runs at the speed of sound, can he still hear his Walkman?
If a pig is sold to the pawn shop, is it considered a ham-hock?
If a turtle lost his shell, is he homeless, naked, or both?