A kangaroo kept getting out of his enclosure at the zoo. Knowing that he could hop high, the zoo officials put up a five metre fence.
Surprisingly, he was out the very next morning, happily jumping around the zoo. A 10-metre fence was then put up, but again, he got out.
When the fence was 20 metres high, a camel in the next enclosure asked the kangaroo: “How high do you think they’ll go?”
The kangaroo shrugged and said: “Probably a hundred metres, unless somebody locks the gate at night.”