No, you're not the only person who thought of it... I came here to see if anyone had done it, and though you didn't do what I had in mind at all, it's essentially the same joke. So I'd have to say this was a good idea, poorly executed.
Funny, someone in my class told me to do the same thing about a week ago. Of course, it's a f*cking 1-2 page essay, so it's not like I can't knock that out in a half-hour. Besides, changing the font size of certain characters changes the leading of the text. The larger your period font is compared to the regular font, a line without a period will make it easy to spot. I know if I was a teacher, and I saw it, I'd call you out.
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