This is pretty minor, but in high school I had a friend whose birthday was exactly six months apart from mine. In my family it's tradition to do whatever activity the birthday-person wants to do, such as eat at a specific restaurant, go to a specific theme park, or just chill out. In her family, half-birthdays were a thing they would do (which I had never heard of before and have never heard of since): family members would get presents on the day exactly six months away from their regular birthday. So the first year I knew her, she asked for a present from me... on my birthday. She was legitimately confused and unhappy that I didn't give her anything. Yeah, I understand that the whole "I get to do whatever I want on my birthday" thing is a bit entitled too, but in my defense I'm one of those people who will bend over backwards for someone I care about and expect nothing in return, so getting to be a little greedy for one day is nice. (Not my story)