I was recently reminded of this cartoon from the hilarious but ever-so-wrong Perry Bible Fellowship (safe for work but avoid if you are easily offended).

Grammar Wizard sets rod for own back

I’ve previously hinted at my dislike for the preposition rule by paraphrasing one of Winston Churchill’s famous quotes (probably misattributed). Nonetheless the cartoon is a funny reminder that if you live by the grammar sword, you die by the grammar sword.