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What do you get if you cross a sheep and a kangaroo ?
A woolly jumper !

A kangaroo kept getting out of his enclosure at the zoo. Knowing that he could hop high, the zoo officials put up a ten foot fence. He was out the next morning, just roaming around the zoo.
A twenty foot fence was put up. Again he go out.
When the fence was forty feet high, a camel in the next enclosure asked the kangaroo,
"How high do you think they'll go?"
The kangaroo said, "About a thousand feet, unless somebody locks the gate at night!"

Why was the mother kangaroo cross with her children?
Because they ate potato chips in bed.

Why was the young kangaroo thrown out by his mother?
For smoking in bed.

What's the difference between a kangaroo, a lumberjack and a bag of peanuts?
A kangaroo hops and chews and a lumberjack chops and hews.
Yes, but what's the bag of peanuts for?
For monkeys like you.

The reuse of some object-oriented code has caused tactical headaches for Australia's armed forces. As virtual reality simulators assume larger roles in helicopter combat training, programmers have gone to great lengths to increase the realism of their scenarios, including detailed landscapes and, in the case of the Northern Territory's Operation Phoenix, herds of kangaroos (since disturbed animals might well give away a helicopter's position).

The head of the Defence Science & Technology Organisation's Land Operations/Simulation division reportedly instructed developers to model the local marsupials' movements and reactions to helicopters. Being efficient programmers, they just re-appropriated some code originally used to model infantry detachment reactions under the same stimuli, changed the mapped icon from a soldier to a kangaroo, and increased the figures' speed of movement.

Eager to demonstrate their flying skills for some visiting American pilots, the hotshot Aussies "buzzed" the virtual kangaroos in low flight during a simulation. The kangaroos scattered, as predicted, and the visiting Americans nodded appreciatively... then did a double-take as the kangaroos reappeared from behind a hill and launched a barrage of Stinger missiles at the hapless helicopter. (Apparently the programmers had forgotten to remove that part of the infantry coding.)

The lesson? Objects are defined with certain attributes, and any new object defined in terms of an old one inherits all the attributes. The embarrassed programmers had learned to be careful when reusing object-oriented code, and the Yanks left with a newfound respect for Australian wildlife.

Simulator supervisors report that pilots from that point onward have strictly avoided kangaroos, just as they were meant to.

From June 15, 1999 Defence Science and Technology Organisation Lecture Series, Melbourne, Australia, and staff reports