Two guys were camping and walking in the peak district and came upon a huge hole in the ground. They approached it and were amazed at its size. The first said, "Wow, that's some hole, I can't even see the bottom. I wonder how deep it is." The second said, "There's an old gearbox over there. Let's throw it in and see how long it takes to hit bottom." So, they picked up the gearbox, carried it over to the hole, counted one-two-three, and heaved it in.
As they were standing there looking over the edge of the hole, a goat came crashing through the bushes, ran up to the hole and without hesitation, jumped in head first.
While they were standing there staring at each other in amazement, peering into the hole and trying to figure out what that was all about, an old farmer sauntered up. "Say, you blokes did you happen to see my goat?"
The first guy said, "Funny you should ask. We were just standing here a minute ago, and a goat came running out of the bushes doing about a hundred miles an hour and jumped head first into this here hole!"
The old farmer said, "No mate, that's impossible! I had him tied to a gear box."