Visiting the zoo one day, a lady noticed one of the kangaroos had a huge set of balls. She couldn't believe the size of these hummers, and when the 'roo ventured close to the bars of the enclosure, she reached thru the bars and gave his cods a squeeze. The animal, startled, jumped clear over the fence and bounded away down the path.

A keeper saw the critter fading out of sight, and running up to the woman, said "What did you do to that kangaroo?"

"I just gave his nuts a tweak to see if they were real!" she wailed.

"Well," he said, dropping his pants, "you'd better tweak mine, 'cause I have to catch that sucker"!