Little Johnny puts a dot on the blackboard

Little Johnny puts a dot on the blackboard

The teacher in her first grade class asks her students to come to the chalkboard and draw something that causes a lot of excitement and commotion. Little Johnny comes up and simply puts a dot on the chalkboard. The teacher asks "what is that?" Little Johnny replies, "it's a period." The teacher says "why does it cause excitement and commotion?" Little Johnny says "it doesn't, but my sister said she missed one this morning and my mom fainted, my dad had a heart attack, and the guy next door shot himself"