Frasier: Ah, actually, Frederick, I'm really okay with those things, I am. I just want you to know that it's okay for you to feel bad about them. You see, when I was about your age, I felt real bad about learning that your Grandpa can't do math in his head. I learned later, of course, that that really wasn't very important because he can do so many other things so well.
Frederick: Grandpa can't do math in his head?!
Frasier: Yes, but- See, that's not really the issue.
Martin: What did you go and tell him that for?
Frasier: I was illustrating a point.
Frederick: You mean you can't do it at all?
Martin: Well, yeah, sure I can, Freddie.
Frederick: I knew you could. What's seven times fifteen? You can do it, Grandpa.
[Frasier writes 105 in the air]
Martin: Uh, 115?
Frederick: Oh, Grandpa.
Martin: Well, thanks a lot, Frasier.