It's one thing to be told all your life how big the restaurant servings are in the US and how it's normal to take home leftovers, but it's another to be faced with it.
But on week one I shocked myself by finding I'd already finished my delicious ravioli, the free garlic bread AND the free chicken and leek soup that came with it.
The person next to me expressed their amazement that I finished all that.
So yes, I need to learn to take leftovers, which six months in, I still forget to do.
My great-aunt lived in the US for 30 years. All my life, whenever she wanted a doggy bag, she'd ask the server for the container so she could pack it herself. It stemmed back to a (now hilarious) experience in New York where the waitress came back with massive a massive bag for her. My Aunt asked "what's all this?" and the waitress said in hushed tones "I gave you everyone else's too" with a wink.