>Three worms going in a line.
>
>1st worm says "there are two worms behind me"
>
>2nd worm says "there is a worm ahead of me and a worm behind me"
>
>3rd worm says "there is a worm ahead of me and a worm behind me"
>
>How is this possible?

3rd worm lies, though I heard it in my youth about turtles.