A class was given a homework assignment to find out something exciting and relate it to the class the next day.
When the time came to present what they’d found, the first little boy the teacher called on walked up to the front of the classroom. He picked up a piece of chalk, made a small white dot on the blackboard and sat back down.
Puzzled, the teacher asked him what it was.
“It’s a period,” he replied.
“I can see that,” growled the teacher, “but what is so exciting about a period?”
“Darned if I know,” the boy replied, “but yesterday my sister was missing one. My mom fainted, my dad had a heart attack, and the boy next door joined the Navy.”