So, you know, the arrow goes halfway and then it goes halfway again and again and again and never gets there. So, that's obvious. So, you could try shooting the arrow and it gets there. But, that's not so obvious, because you might say "Gets where?" "I don't know where there is.". So, somebody points and they say "You know. There". But, since you don't see anything that he's pointing to, you shoot the arrow and it never gets there. See...Easy!