This isn't exactly a JOKE, but PUNCTUATION IS POWERFUL!
The english teacher writes the following sentence on the chalkboard:
Women without her man is nothing.
He said to re-write it with correct punctuation. Great idea, Mr. Punctuation.
All the males wrote, "Women, without her man, is nothing."
All the females wrote, "Women: Without her, man is nothing."
Boy, punctuation sure is powerful.