?

A few weeks ago, I asked a passenger what she wanted for a snack, and she asked me what we had. I've been repeating 'cheese crackers, cookies, and peanuts' for so long that it doesn't even bother me anymore when someone isn't paying attention, so I spouted the litany off to her again. And then she said, "Oh. I had heard you before. I just thought you were kidding."
I've had a few weeks to think about that, and I still come up with the same thing: what the hell does that mean?