I'm currently watching The Great Wife Hope which I know I have never seen before. However, while watching the opening couch gag, I was convinced I had seen the start before on a different episode. I have also seen the text Bart writes on the whiteboard in multiple episodes being the same.
I heard somewhere that the writers try to make every Simpsons episode unique, including the opening. After experiencing this déjà vu, I questioned this. So I thought I'd bring it here. Is the opening to every Simpsons episode unique? Can anyone answer this?