Two miners are walking through the bush, and see a mining shaft,
One miner says " I wonder how deep it is ??" and throws a rock down, they listen for a few minutes, but nothing,
Other miner says, " we need a bigger rock ", so they throw down a bigger rock, still nothing,
First miner see's a really heavy " railroad sleeper " and says, " let's throw that down ",they struggle dragging it over to the shaft and down it goes,
Before they can tell if the sleeper hit the bottom, a goat runs flat out from the bushes, and runs straight down the shaft, between the two miners, they are stunned with amazement,
Next a farmer appears from nowhere and says, Have you guys seen my goat?
Well the first miner says, " we just seen a goat who was running, come out of the bushes and ran flat out straight down this mine shaft"
The farmer replied, " can't be my goat, my goat could not run cause he was chained to a " rail-road sleeper "