Lyric discussion by flashg 

Cover art for Word Crimes lyrics by Weird Al Yankovic

It said "You would not use 'its' in this case" - I've just corrected it to "it's". The video will help you to see why: it shows an example wrong sentence, "Every dog has it's day". The point is to show that "it's" is wrong here - you should be using "its". https://www.youtube.com/watch?v=8Gv0H-vPoDc