If you try it, wait until the coffee has cooled before pouring it over the ice. Otherwise the melting ice will dilute the strength.
Oh..and for those of you that garden...feed your garden veggies your coffee grounds and leftover coffee. Earth worms go apeshit over them and the oils from the coffee keep snails, slugs, and other bugs off your plants if you spray the leaves.
Great for the compost bin too! (yes I garden...anyone want a courgette? LOL)