Christmas, the year before my mother was married.
We went to my mother's father and step-mother's house for Christmas. My step-grandmother was thrilled to be cooking Christmas dinner and had planned an elaborate pineapple marinated meat dish. In the meantime, she let me help her decorate the tree in ribbons and tinsel (I was about six?). Unfortunately, she hadn't cooked with pineapple before, so she didn't do it right and the meat disintegrated. She was upset, but we all laughed it off and ate mashed potatoes, rolls, and dessert for Christmas dinner instead. I remember it fondly, because she was so distraught about ruining dinner and everyone was chuckling and trying to console her. I even tasted it for her.