It's Halloween at Seattle Grace! There may be jokes, pranks, and/or scare tactics. Some of the women form a club based on an experience they all share. A man volunteers for what most of the doctors believe is an unnecessary surgery. One of the patients is in the hospital because they tried to carve a pumpkin in an unconventional manner. Alex receives a visit from Jane Doe/Ava/Rebecca. Meredith is having mommy issues. Callie has an announcement to make.