Some years back, when I lived in N. Wales, One of my son's had a friend round after school. I asked if they'd like fish finger, chips and beans for tea? Both said yes with enthusiasm. They sat at the kitchen table looking at football cards or some such thing and I got the spuds from the pantry and put them in a bowl at the other end of the table. When the kid saw I was peeling them he asked me why? i said I was going to fry them as chips and carried on. His reaction was one of shock. He insisted that chips came frozen from Iceland and were cooked in the oven. Obviously he had to concede the point as the tea progressed but his faith in his Mother was shattered forever...