A birthday lets you know where you are in time, right? It's like a mile marker. We could also celebrate and sing to people that we care about on days that are not their birthday. Like I could call my mother-in-law on October 10th and say, "I just want to tell you, thank you for giving birth to that one"
Birthdays! Why do Americans prefer Thanksgiving and the Fourth of July to theirs? Why do they make Stephen think of molasses and chicken feed? And is “Happy Birthday” the worst song ever written?