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 upon 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 Daddy had a heart attack, Mommy fainted and
the man next door shot himself."