What is Amish Mistake?
May be abbreiviated as "Amish". Something incredibly stupid that occurs to spoil an otherwise perfect situation. After an Amish custom of leaving deliberate skips in the pattern of quilts, lest a perfect design make the Almighty jealous.
When we drove to Scotland for the weekend, my forgetting to fill the tank before going about the Highlands was the Amish mistake of the outing.