Answer:
What can you catch but not throw?
Long legs, crooked thighs, little head, and no eyes.
I pass before the sun, but make no shadow.
You will find me with four legs, but no hair. People ride me for hours, but I don't go anywhere without needing to be tugged. Jerked or turned on, I always manage to be ready for work.
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.