While waiting for her first appointment in the reception room of Dr. Leah Cohen, her new dentist, Miriam Kleinman suddenly remembered that a tall girl with the same name had been in her high school class some 40 years ago.

Upon seeing her, however, Miriam quickly discarded any such thought.

This gray-haired woman with the deeply lined face was too old to have been her classmate Leah. After Dr. Cohen examined her teeth, Miriam asked her if she had attended the same high school.

"Yes," she replied.

"When did you graduate?" Miriam asked.

Dr. Cohen answered, "In 1957."

"Why, you were in my class!" Miriam exclaimed.

Dr. Cohen looked at Miriam closely and then asked, "What did you teach?"

Today's joke was taken from Aish.com.