Lullabelle
Midlands, England
I think I mentioned it before so I'll keep it short, but when we moved to the UK in 1992, one of our "cultural awareness" classes covered restaurant differences, and one thing they mentioned was that doggy bags were very much not the norm in the UK at the time, and to not expect it.
Sure enough, we forgot that, and during our first "nice" meal out, we asked for a doggy bag for the leftovers, and the waiter looked at us like we had three heads, but also did his best to accommodate us, bringing our food back out to us in one of the cooks' metal mixing bowls!
We were so embarrassed that we'd forgotten that, and I promised to bring the bowl back (which I did), even though he kept saying not to bother about it.
Taking home uneaten food is becoming more of a thing now, a lot of restaurants are becoming involved great idea as it cuts down on food waste.