Today, the lady at the coffee van put too much milk in my cappucino. I looked at the dome of foam on top of the cappucino. She hesitated, before putting down the lid. Would there be a spill? She decided to chance it and, positioning it carefully, pushed on the lid. A spurt of bright white foam squirted up through the sipping hole, hung briefly in mid air, and dropped back to land squarely in the middle of the lid, with not a drop spilt. She handed it to me, with an air of achievement, the top decorated with a slurp of shiny foam. It tasted great, too!