The Three Musketeers are all at Callie's ultrasound, which shows she's doing great for 23 1/2 weeks. Mark tries to get Lucy to slip and tell them the sex of the baby but she doesn't fall for it. Arizona's not amused by his antics and Callie reminds him with a hint of a warning tone that he was outvoted and they are going to wait. Callie's blood pressure is high but she insists that just from the nerves and excitement of her shower, which is that afternoon. Arizona acts more like it's an upcoming funeral, but Callie is giddy with excitement to make everyone else give her nice gifts and play stupid games like she's done so many times before. There's a moment of awkwardness when it turns out Arizona hadn't invited Lucy but Callie makes her promise that she'll stop by.
Bailey walks down the hall to find four of the residents staring silently at the men's room door. It's more Chief Resident race craziness -- Richard's funding came through for his diabetes clinical trial and so they are all now stalking him to take part. When he walks out they descend like vultures but he shuts them up and storms away. Bailey reminds them that they should act like surgeons and impress him with their work, then grabs Avery and takes off down the hall. Cristina is supremely confident in her surgical skills but isn't above scheming and she saunters over to her husband to see if he'll put in a word for her. He won't do that, but he will tell her that she's pretty, and she pouts but continues her scheming.
Derek goes to greet a patient actually in his trial, and I squealed with excitement to see that she is played by Marina Sirtis, who I love and will forever see as Counselor Deanna Troi. (Star Trek nerd alert!) I'll actually refer to her as her character name, Sonya, because it makes me sad to think of Troi as having Alzheimer's. (Super-extra ST nerd alert!) She is there with her son Tarik, who flew in from London as soon as she got into the trial. They both seem totally lovely, but Tarik is understandably a little bit on edge. Mere goes through her usual questions and when she asks Sonya what she did for Thanksgiving, Sonya incorrectly remembers a Thanksgiving three years previously with Tarik and his then-partner Gavin. Mother and son argue about the relationship as parents and children are wont to do, since Sonya obviously loves Gavin but Tarik insists they aren't getting back together. Mere breaks in to change the subject back to the trial and asks Sonya to count backward from 100 by 7. Man, I'd have to be really careful to do that successfully that even with all of my mental faculties.