A man takes a basketball and throws it as hard as he can. There is nothing in front, behind, or on either side of him, and yet, the ball comes back and hits him square in the face. How can this be?
He threw the ball up
No matter how hard you try, I can open what you can't. If it wasn't for me, on your front porch you would stand.
What am I?
You are driving a car. On your right is a steep cliff. In front of you there is a horse and right behind is an elephant, both of which travel at your own speed. On your left there is a fire truck blocking you. How do you stop your car?