Nathan: Could it be used to catalog other things?
Sheldon: Yes, the applications are endless.
Nathan: So there could be a database of, I don't know, available women?
Sheldon: Available for what?
Nathan: At this point, anything.

Sheldon: Why would New Mutants be next to New Teen Titans?
Missy: Because they both start with "New"?
Sheldon: But one's Marvel and the other's DC. Would you put Aquaman and Sub-Mariner next to each other?
Missy: I don't know, they could talk about fish.

Adult Sheldon: In the world of collecting, I'm what's known as a completist. For example, I own every gauge of model train from the mighty "G," to the tiny "T." Look at how cute it is, I just want to eat it up. However, the downside of being a completist is when something's missing, it's like an itch you can't scratch, even if you own a complete set of Justice League back scratchers... which I do. In this case that itch was the comic book issue Doom Patrol and Suicide Squad Special #1.

Sheldon: What do you mean, you sold it?
Missy: Somebody gave me money, and I gave them the comic book. That's kind of how things work here.