An elderly lady, who lived on the third floor of a boardinghouse, broke her leg. As the doctor put a cast on it, he warned her not to climb any stairs.

Several months later, the doctor took off the cast.

"Can I climb stairs now?" asked the little old lady.

"Yes," he replied.

"Thank goodness!" she said.

"I'm sick and tired of shinnying up and down that drainpipe!"