Almost Iced Americano

I have access to ice-cubes at work. I use them to prepare Iced Americano (well, something resembling it, at least!), which makes a cool summer drink. I fill one cup till the top with ice cubes, and then pour on it one-and-a-half hot espresso shots taken from the coffee-machine (without diluting, as done with regular Americano). In about 30 seconds, the drink is ice-cold.