Great logic

Anya is leaving for Seattle tomorrow, where she will visit her uncle. I was charged with printing her boarding pass.

Mom: Do you have a good seat?
Anya: Yes.
A.: She has an exit row-- that's great.
Mom: Is it a window seat?
Anya: No.
Mom: That's too bad.
Anya: Actually I prefer it.
A.: I've learned to love window seats, too. Being able to get up regularly on a long flight really minimizes the back pain that often comes with a long flight.
Mom: I never had back pain when I was your age. It's because you're a vegetarian.
A.: What??
Mom: I never had back pain, and I'm not a vegetarian. Your back pain must be because you're a vegetarian.

Later

Mom: You should eat nuts.
A.: What?
Mom: To strengthen your bones. So that you don't have back pain.
A.: Bones have nothing to do with it, and nuts are a regular part of my diet.
Mom: You said you had pain in your bones.
A.: It's not a bone strength issue. Can I write this letter, please?