An old bloke in the Northern Territory was showing some tourists how to 
top up a camel with water.
"That way," he said, "You get an extra day out of them between drinks."
As the camel bent down to drink, the bloke picked up two bricks and bashed 
them over the camel's balls.
The camel sucked in its breath and took on three days' extra water.
"Doesn't that hurt?" asked a tourist.
"Nah," replied the bloke. "Only if you get your fingers caught!"