A kangaroo at the zoo kept

A kangaroo at the zoo kept getting out of his enclosure every night.

Knowing that mature kangaroos could hop very high, the zoo officials replaced the eight-foot fence with a ten-foot fence.

He was out the next morning, just roaming around the zoo.

They tore down the ten-foot fence and put up a fifteen-foot fence.

He was out again the next morning.

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 thinks to lock the gate at night