Have you ever experienced a \"once-in-a-lifetime\" event? What was it?

Unfortunately, I never experienced a \"once-in-a-lifetime\" event before. However, there is most memorable event. It happened two month ago on my birthday. The wireless earphones I was using were getting old, so I was paying attention to the \"Buds\" earphones from Samsung. I expressed my desire to have it to my parents and younger brother, but I wanted to get a job and buy it with my own money, so I kept window shopping. But on my birthday, a package that I didn\'t order was delivered, and when I opened it, I found out that the Buds earphones I wanted were purchased in my favorite color. Later, I found out that my parents and younger brother collected money and bought the earphones they wanted for my birthday and gave them to me as a surprise gift. I was so surprised by the unexpected situation, and I was so happy. It was the most touching birthday present I have ever received and I could feel the love of my family.