Rinse the can well before starting. Now also cut the lower part of the can in order to obtain an open shape. Then push on the can and form a heart by keeping your thumb on the lower part of the open circle and by exerting force with your index fingers on the upper part of the box. This way, you will create a nice heart in a jiffy.
Tip: the small heart can be used as a mould for your cupcakes.