One of my favorite Halloween traditions is watching The Simpsons 'Treehouse of Horror'. This year 'Treehouse of Horror XXVII' already aired on October 16. But it's the year 2016 and if you haven't seen it yet, it's pretty easy to figure out a way. Or, if you prefer, check out one of the classic episodes from earlier seasons. Not sure which one to watch since there are 27 of them? Stay tuned and I'll help you out.