This actually happens to me quite often, but I will share a story from many years ago. I was on a flight to Beijing, it was the middle of the night and only a few passengers were awake. I randomly started thinking that ice cream would taste good at that moment. Then I wondered if they even had ice cream in China because Chinese food doesn't seem to include dairy. Anyhow, right then a flight attended approached and offered ice cream sandwiches to those who were awake. I remember this because it wasn't usual to be offered mid-flight snacks other than the usual peanuts.
Jane S 