Claire: Mom! What is she doing here? She's not even related to these people!
Mitchell: Oh, my God. You, me, Mom, Dad, alone. Without Gloria to absorb the hate. Okay, why am I scared? I'm feeling scared.
Claire: Because you are flashing back to every family event that ended with Dad whisper-screaming at Mom, "Would you calm down?" while she would swing her pocketbook around until it burst open like a pill-packed pinata.