I have a few, none are from YOMD (yet, we're going in February so it's always possible!)
Our first trip to WDW we had a birthday breakfast for DD #1, she was turning three and loves the princesses. We surprised her with the breakfast and she was just thrilled to be eating at the castle and was literally too stunned to speak for quite awhile. Next thing we know Aurora is at our table and pulling DD#2 out of her stroller and having girl time with both DD's. She called over the other princesses and by the time they were done the three kids were covered in kisses - it was just amazing.
Belle getting kissed by Belle
Ami when it was over...
Poor DS was hiding under the table for most of this, but the princesses got him anyways.
The second one was April 2005 at
Disneyland, it was our last day there before driving out to Vegas and we were all sad to be leaving. We'd saved the Aladdin show for last and were running (with two strollers) to get in line. A CM showed up with a magic lamp and asked DD#1 and DS if they wanted to make a wish on the lamp. They did and wished for good seats for the show, the CM told them to follow her and she'd see what she could do. We were taken to the VIP holding area and were allowed in several minutes before everyone else to find our perfect seats. We were front row center

it was amazing!! DD#2 clapped and bounced through the whole show (she was 10 months old) and the other two were just glowing they were so excited and happy. The whole thing was topped off by Aladdin waving to the kids - DD#1 is still talking about it.
We had a lovely CM at DLP give us an employee discount on tickets on our last trip too since most of us were getting APs and DD had a normal ticket he gave us a discount, he made our morning!