Lay your serviette out flat and square before you.
Bring the top and bottom right corners into the top and bottom centre of the serviette so that there is a vertical line running down the middle. Repeat with the left top and bottom corners. You should have before you a tall rectangle with a vertical gap running down the middle.
Place your finger in the very centre of the serviette where the two flaps meet each other. With your other hand take the top right flap and pull it to the right, going past the top of the rectangle so that it make a triangle shape a little like the flap on a collar. Repeat with the top point on the left side. It now looks like the collar on a shirt with rather a wide neck at the back.
The next step involves making a mirror image of the last step at the bottom, if it's easier then carefully turn your serviette around do that the collar is at the bottom upside down and then just repeat the previous step at the top as before. Once all four flaps are completed you will have before you a rectangle that has 4 triangles radiating out from the centre a little like a windmill.
Starting at the bottom upside down collar part, take the bottom left and right edges and roll them as tightly as you can up to the centre of the serviette.( I set a glass on mine to keep it there while I did the next step).
Turn the entire serviette around to the that roll is at the top and the collar bit of the top half is now upside down at the bottom.
Accordion fold the bottom bit up to the centre (it will meet the roll at the middle).
Now gather both ends (without letting it all unfold) and the roll should be in the middle.
Place it into an empty water or wine glass and fan out the accordion fan bits at each side. So easy!