Lit Hub recently looked at the grammar penal code and realized that there are no absolutes in grammar. As they say, "Grammar purity is one big Ponzi scheme." And they're right. We know most grammar rules as well as their exceptions. An there are always exceptions. 

Grammar is a lie! 

Or at the very least, each person has their own grammar rules, and who's to say if they are right or wrong? Check out the full article here!