Here is mine. It happened about 6 years ago. I took dd1 (then 3) to a local gala. By the gate was a man selling helium balloons and dd1 asked if she could have one. I said I would buy her one when we left, on the way home. She waited very patiently for her balloon at the gala but was getting more and more excited about it (bless). Naively, I thought that they cost about £1 so imagine my shock when I was told they were £4.50 each!! I didn't have enough money for one - poor dd was so upset. She held it together until we had gone about 10 yards away but then burst into tears . While I was consoling her I felt a tap on my shoulder - and the balloon man silently handed me a balloon. Dd1's face (and mine) were just a picture! She was so thrilled with the balloon and it lasted about three weeks too
Six years on every time I think of that it brings a smile to my face