The 30 Rock star was about eight when he stumbled in on his mother getting ready for Christmas - and he still feels that he stepped from boyhood into manhood that night.
Baldwin, who voices Father Christmas in new animated film Rise of the Guardians, recalls, "They were like, 'Shhh, come in,' and they told me what was going on. I don't really remember it that well, but... I think they only told me because the more kids my mother had the more wrapping they had to do.
"I became enlisted as a wrapper of gifts that night. My mother said, 'Come in here, I'm going to tell you something right now... Now pick up those scissors and let's go!'
"So I think that's really what it came down to. I was only devastated because it meant more work for me. I had to wrap presents all night."