"To those who care about punctuation, a sentence such as Thank God its Friday (without the apostrophe) rouses feelings not only of despair but of violence. The confusion of the possessive its (no apostrophe) with the contractive it's (with apostrophe) is an unequivocal signal of illiteracy and sets off a Pavlovian kill response in the average stickler."
Punctuation
Apostrophe
Humor
Writing