There is a lot of things when I was a kid growing up on the West Coast that did not make sense to me. I had always chalked it up to there just being old sayings or traditions but since we have moved out to the East Coast I understand how they came to be.
Thanksgiving: All the pictures I had seen of Thanksgiving Turkeys are colorful with purple heads and almost a peacock plumage in the back. Anyone who drove past the Turkey farm on the 60 freeway in Los Angeles (You'd remember the smell if you did.) know that Turkeys in captivity are all white. Any wild turkeys I have seen were small, brown and just a little larger then a chicken. I was amazed when I saw a wild Turkey here, they look just like all the cardboard signs from my childhood.
White Christmas: My wife tells me of the snowy Christmases she would have in Utah of getting a bike for Christmas and it doing no good since it is to cold outside. All the Christmas songs actually make you want to things like drink hot chocolate here when you don't have to have the air conditioning on like I remember one year.
Groundhog day: I have never seen a groundhog until moving to the East Coast. When I was a kid I always thought it was something similar to a gopher, not something as big as a cat. (I thought the one off of the movie "Groundhog Day" was a fat one in captivity.) February in California is also the rainy season so the groundhog seeing his shadow would mean less of the much needed rain. (Or whichever it is, I never could keep them straight since it did not matter to me.) Speaking of rain, the saying "April showers brings May flowers" is true here. April in California brings the Santa Ana's which leads to Summer starting in May. So by that time most things are brown. In Oregon everything is green and rainy year round so it really doesn't make sense.
TV showtimes: Every commercial always announces a TV show time something like "8/7 Central". No math is needed since I'm already on Eastern Time. (With cable something on at 8ET would be on at 5 pacific time.)
They just cater to you. Being part of a big enough group to be catered to is a very different feeling to me. I am not used to it at all. I am starting to see how the baby boomers see life.