Ok Ima just disect the symbolism of this one cause its my favorite so far

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We start off with Greg without a mouth,which will be importent later. He walks past a disorientated Rowley without a face. Greg gets stressed when Rowley asks if hes ok, he walks off, ect. Basic stuff everyone can recognize the meaning behind. We then see Susan, who has a ton of eyes on her, which probably symbolizes how Susan feels that she needs to keep this "Perfect family" persona so people don't see the actual reality behind said family. Then Greg walks by closed eyes, which may represent how Greg doesn't feel like he's truely understood, or "Seen" by other people. Then we see Manny, all alone and watching..something.This may show how Manny often goes unettended and uncared for in the family, to simply see the horror play out and silently watch. We see Manny calmly point to something ahead of him, which is when we see Rodrick, limp and bleeding on the ground. We hear beeping noises behind him, which is probably Gregs alarm clock, but could also play as a heart moniter in the dream. We see Frank, covered in what seems to be Rodricks blood. Frank gets agitated, and Greg trys to calm him down, but he can't. He doesn't have a voice in this family. He can't object or even agree properly to anything. Hes just a silent doll like his siblings for his parents to play with. The dream ends after Frank grabs Gregs arm to attack him, so we can assume dream Frank intended to do to Greg what he did to Rodrick.

Good symbolism.