Two aboriginals come across an old mine shaft. They know that if they throw a rock in, and count how long it takes to land, they can work out how deep it is. So they throw in a pebble. Can't hear it land, they throw in a larger stone, still can't hear it, they throw in a big rock. still nothing, nearby they see a railway sleeper, throw that in.
Suddenly, out of the bushes comes a goat, snorting and running, straight for them! They dive out of the way just in time, and the goat goes down the mine shaft!
They brush themselves off and get up. Soon a man comes along, and asks them "have you guys seen a goat?"
They lie, cause they don't want him to blame them for his goat going down the hole, so they say "nah, we aint seen no goat"
The man looks at them and says "well he wouldn't have gotten far, he was tied to a railway sleeper"
