A man was out walking one fine day and hears someone, or something, in the far distance. Intrigued by the sound, he walks towards it and ascertains that it is coming from behind a hill not far away, but he can't see who or what is causing it. As he draws ever closer he makes out a voice '45',...'46', ... '47'. And a soft thud after each number. So he draws closer still, and now can clearly hear '48' <thud>, '49'<thud>. So he peeks over the top of the hill, and as he does so falls off the cliff, and the voice says '50'.