Can you keep a secret? Have you ever — intentionally or not — spilled the beans (when you should’ve stayed quiet)?

One time I spilled the beans. My mom said I was about four years old. My dad bought her a huge punch bowl and platter for her birthday. When my dad and I returned from the store, I said, ” We got you a bowl. But it’s a surprise.”
Since then I have been successful at keeping secrets. However, I’m not as successful as my grandma. She knew a secret about her friend giving a baby up for adoption. She never told anyone. My uncle discovered the secret at least forty years later from a different source. It makes me wonder what other secrets grandma knew.