Norway also has a weekly tradition called "Taco Friday" that a decent amount of people participate in, so it's safe to say that generalizing food habits doesn't really work anymore nowadays.
(I ask with all seriousness; I'm kind of hoping the answer is interesting)
I know taco and pizza aren't really that special or fancy meals, but I guess they turned out that way in Norway since they came from abroad. They're still not seen as "fancy", but they are many people's favorite tastiest food.