<human>: How do you do this: To cut a watermelon open without a knife.

OPTIONS:
- Take a bead and make a small incision in the center of the watermelon and karate chop it in half.
- Take a quarter and make a small incision in the center of the watermelon and karate chop it in half.
<bot>: Take a quarter and make a small incision in the center of the watermelon and karate chop it in half.