Mary: You can't wear that. No one else is gonna be dressed up.
Sheldon: That's fine. I plan on pretending I'm a neutral observer of an alien culture.
Mary: Or you can go and play with the other kids and wear pants from this planet.

Sheldon: I thought you said I was supposed to have fun.
Mary: Go and change. You are not wearing that.
Sheldon: Then I'm not going.
Mary: You're going.
Sheldon: Then I'm wearing this.
Mary: No, you're not.
Sheldon: Yes, I am.
Mary: Well, if you're gonna wear that, you need to participate.
Sheldon: Participate how?
Mary: Party games, cake and singing "Happy Birthday."
Sheldon: No games, one slice of cake, and I will mouth the words while the others sing.
Mary: One game, and you need to interact with the other children.

Sheldon: Fascinating. It seems to be a carbon-based life-form. [to Mary] I'm interacting.

Dr. John Sturgis: I've been feeling the loss very profoundly and it's making me wonder if she also is feeling lonely and I made a bad decision for both of us.
George: I hate to be the one to tell you this, John, but, uh she's kind of been seeing someone new and, uh she seems to be doing okay.
Dr. John Sturgis: I see. [stammers] Is she happy?
George: Hard to tell. Her face is all scrunched up and pinched most of the time.
Dr. John Sturgis: Well, I hope this man she's seeing treats her well.
George: He seems okay.
Dr. John Sturgis: I also hope he gets lost at sea and never returns. I'm having a lot of feelings.
George: Well, when that happens to me, I have another beer.
Dr. John Sturgis: I haven't finished this one yet.
George: More for me.

Brenda Sparks: Hope you're happy. Billy's missing his own party 'cause he's playing spaceman in the chicken coop with your son.
Mary: You were right. I shouldn't have made you invite him. I'm sorry.
Brenda Sparks: Okay. Well, good.
Mary: It's just hard to see him be left out. And I worry it's not gonna get better when he grows older.
Brenda Sparks: Can't say that Billy is exactly Mr. Popular either.
Mary: I'm sure this kind of stuff bothers me way more than it bothers Sheldon.
Brenda Sparks: Doesn't make it any easier, does it?
Mary: No.