This appeared in the Wall Street Journal last year, credited to one
Barbara Garybeal.

Harvey Roehl

 - - -

    Grammar Gaffe

The language lapse that drives me into fits
is using "it's" when what one means is "its."

It isn't asking much, it isn't oppressive,
To learn "its" is a pronoun;  the possessive.

Nor, need one be a great linguistic whiz
To know that "it's" is short for "it is."

Why must so much catastrophe
result from one apostrophe?