My parents remarked that a character in a movie was gay and my brother blurted out, "Just like ACQ!" so he kinda dragged me out, but my parents were totally accepting. Honestly, I'd been dropping massive hints for a while leading up to that so they probably already knew, but still
I do have another which is coming out to my grandparents. It was valentines day and my grandma asked me if there were any boys I liked. I said, "No, but there is this one girl." She went on perfectly casually, asking if she knew the girl I liked and all those other 'adults hearing their kid has a crush' questions. The thing that makes me even more relieved that this went well is that my grandparents are Christian, and I was scared they'd be the homophobic kind. Thankfully, they're the good kind and were very accepting.
TLDR: Brother dragged me out of the closet to my parents, and grandparents are accepting too