Two men were travelling through South Georgia and lost the muffler off their car. They went to a junkyard to find a replacement. The owner said, "Look around, and if you can find one that fits your car, I'll sell it to you for $10. There are just two things I want to warn you about as you look around my junkyard. There is a bottomless pit out there and there is a Rottweiler dog out there."
The men found the bottomless pit. They threw rocks into it, and sure enough, it appeared to be bottomless. To find out how deep it was they pushed an old engine block into the hole. Just then, the Rottweiler appeared with fangs bared, foaming at the mouth, snarling like a wolf. But like a flash the dog shot past them and disappeared into the pit.
The men reported what had happened to the owner. They described their discovery of the pit and that the dog had jumped into the pit to his death.
"Not likely," the owner said, "I had the Rottweiler chained to an old engine block."
Get someone to explain it to you.