STJ, You do realize your own answer is rife with mistakes?? "You end up looking silly if YOUR" (should be you're)...
"Spelling "inccorrecty"" (should be incorrectly) and "arguement" should be "argument"....
I think you need to reconsider your own position there, my friend!!
I'm a university prof, so I admit spelling errors drive me mad. Unless English is your second language, the rules of the apostrophe and basic words should not be beyond you. It's not rocket science. The trouble is the internet reinforces bad spelling since people get used to seeing words spelled incorrectly. A simple spell checker (and an effort to learn from your mistakes) goes a long way.