Have your friend grab a packet of sugar from the coffeehouse prep bar. Explain that you will show her how to enjoy coffee without a cup. You then pour the sugar and a tiny bit of coffee from the suction of a straw into your closed and empty fist. After a squeeze, you open your hand to reveal that the coffee and sugar have both vanished and in its place is a small fistful of coffee beans — without any help from Vernet!