Turkey
"I wanted a turkey," she told him angrily. "And stuffing and roast potatoes and even brussel sprouts. A normal, non alien Christmas dinner!"
"I thought you'd like it," said the Doctor. "What's gotten into you, Pond?"
"I'm tired." She sat down. "I want to go home. I'm tired of fighting and of things being weird and different."
"I'll get you a turkey," said the Doctor, unsure of what else to say.
"This isn't about the turkey," she sighed.
"What?" asked the Doctor, confused.
"Oh, Doctor," said Amy. "Despite all the time you spend with us, you just don't understand humans."