Learn how to make a 'Paper Balloon/Water Bomb' by watching this tutorial. Take a square piece of paper. Fold the paper diagonally to make a triangle. Open the paper to reveal a diagonal crease. Repeat the same with the other end, to make a crease which is perpendicular to the first one. Open the paper to reveal an 'X'. Now fold the paper at the center, to make a rectangle. Next, push the edge along the central crease to the middle at both ends and crease well, as shown. This makes a triangle with two flaps on either side. Take one flap and fold it to touch the central point, as shown. Repeat the same with the other flaps. This makes a square with four flaps. Now fold each flap to the point in the middle. Fold each of the free ends of the flaps to the point in the middle. Tuck them inside the adjacent pockets. Now blow air into the cavity revealed at one end. That completes your paper balloon. Alternatively, you can fill water inside and use it as a water bomb!