Morty (talking to the giant arm): Wh-What if we...didn't do it? What if we just went back to the Blood Dome and just kept taking our baggage out on unrelated people? I mean, w-we could do that forever. I mean, II know it's less healthy, but ww-we'd be together and ...
Morty: You're right. We both got to see our stuff through. I got to deal with my parents' divorce, and you got to, you know, do what you got to do. I love you.
Morty: Maybe the lesson we've learned is that, whether it's our parents' marriage, a glowing green rock, or an awesome giant arm, sooner or later, we got to let it go.
This point in time is inevitably poked by the let it go snippet...and as Rick said in an earlier episode, it's blessing with disguise.
Summer: This is the first mutant I killed in the poison zone. I was raiding his hovel. He had a chance to escape, but he looked back, which is something we shouldn't do, which is why I shouldn't believe in souvenirs or trinkets or symbols or housewarming gifts, but, Dad, I wanted to give you this as a reminder...not to look back.
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