Sheldon: On a cheerier note, I have a teeth-cleaning appointment this afternoon. What do you say you take me over there, buddy boy?
Stuart: I'm sorry, you want me to take you to the dentist?
Sheldon: Yes. And now, I can't make any promises, but that's the sort of thing that gets a fella on the short list for the number eight friend slot.
Stuart: Sheldon, I'm working. I can't take you to the dentist. Also, and I can't stress this enough, I don't want to take you to the dentist.
Sheldon: Can't help a friend out in a time of need, huh? I see where your therapist was coming from.