The kindergarten class had a homework assignment to find out about
something exciting and relate it to the class the next day. When the
time came for the little kids to give their reports, the teacher was calling on them one at a time.

She was reluctant to call on little Johnnie, knowing that he sometimes could be a bit crude. But, eventually, his turn came...

Little Johnnie walked up to the front of the class and, with a piece of chalk, made a small white dot on the blackboard, then sat back down.
Well, the teacher couldn't figure out what Johnnie had in mind for his report on something exciting, so she asked him just what that was.

"It's a period," reported Johnnie.

"Well, I can see that," she said, "but what is so exciting about a
period?"

"Damned if I know", said Johnnie, "but, this morning, my sister said she missed one. Then Dad had a heart attack, Mom feinted, and the man next door shot himself."