Seeing Mark's face during that last episode was honestly priceless. He sat there completely silent for a full minute after the credits rolled. It's that kind of real, stunned reaction that makes rewatching with someone so fun. We ended up starting the whole series over the next week because of it.
That finale really did change how I see the whole show. I always thought the twist was a cheap trick until I watched it again last year. Seeing Mark's reaction, Jason, actually made me go back and pay closer attention to the earlier episodes. Now I notice all the tiny clues they planted from the very first season. It went from my least favorite ending to one I actually respect. The writers really did plan it out.