1. Wash watermelons under cool running water and pat dry.
2. On a cutting board, place the roundest watermelon on its side and cut off 1/4 to 1/2 inch of the stem end, being careful not to cut too deep into the white part of the rind. This will provide a sturdy base.
3. Using dry-erase marker, draw two eyes, an oval for a nose and a smiling mouth that would resemble a bat. Draw two ears and an outline of a forehead, continuing the line around to make the top for the bat that will be removed.
4. Use a knife to carefully cut away inside of the eyes, nose and mouth and also around the top of watermelon. Remove top and hollow out watermelon with spoon, reserving fruit to use in a fruit salad or punch.
5. On the second watermelon, use dry-erase marker to draw 2 bat wings (the top of the wings will have 2 points and the bottom of the wings will have 2 points). Use knife to carefully cut wings out, reserving inside of watermelon to make fruit salad or punch.
6. Attach wings to side of watermelon bat with wooden skewers, and use toothpicks to attach candy-corn as fangs.
7. Insert a candle to light up your bat.