This user understands the difference between its and it's. So should you.
’s
Thi's user know's that not every word that end's with s need's an apostrophe and will remove misused apostrophe's from Wikipedia with extreme prejudice.
’s
This user realises that plural nouns should not have an apostrophe while possessive words should!
"..!"
This user believes that punctuation should always come on the inside of quotation marks.