Your grammar is not so excellent for a self-proclaimed Grammar Nazi. 
Normally I don't care, but the thing I see most on the Internet is misusing the misuse of "your" and "you're".
You probably don't care.
I am just forewarning you in case I smite thee with the mouse of an angry forum crawler because you can't tell the difference.
And as An impromptu lesson:
"You're" is a contraction of "you are."
EX: You are going to the store.
You're going to the store.
"Your" is used to denote possession of something.
EX: Is this your hat?
I took off my shoes and put yours on.
Thanks for the time.
None of that was grammar it was word usage.
I don't have to put the I am in front of forewarned because nobody else could be forewarning you from my post.
And the contraction you're is a combination of the words you and are
And using of instead of off was merely a typing error
The and as isn't necessarily bad grammar just poor sentence construction
1: Yes, it was.
2: You DO have to put the "I am" in front of "forewarned;" otherwise it is a sentence fragment.
3: The contraction "you're" (notice how there are quotation marks around the word) is NOT a contraction of the words "you" and "are." It is a contraction of the
phrase "you are."
4: That's understandable, but if you want to be a grammar Nazi (Nazi is a proper noun, therefore it is capitalized), then typos are unforgivable.
5: Your usage of "and as" is not okay because A) it establishes the caption as an attempted sentence, and therefore as a fragment, B) "and" is never used at the beginning of a sentence, and C) removing "and as" is the simplest way of turning what was a fragment, into a
title, which does not necessarily have to be an independent clause.
All WERE grammar issues. Word usage is likely the most ubiquitous example of grammatical error in native speakers of English. The incorrect usage of the words "who" and "whom" is an example of a common, grammatical error that is also an error of word usage.
We, grammar Nazis, must uphold our honor. Lax standards are unforgivable. No fragments, no errors, and no love shall be permitted in our brotherhood of the anonymous rectitude of random individuals' grammatical shortcomings.
