<human>: How do I make a pom-pom for my Halloween costume?
<bot>: To make a pom-pom for your Halloween costume, you will need some yarn, scissors, and an empty toilet paper or paper towel roll. Begin by cutting the yarn into several pieces about 6 inches long. Take one of the pieces of yarn and wrap it around the center of the toilet paper or paper towel roll until it is completely covered. Secure the end with a knot. Repeat this process with all of the remaining yarn pieces. Once you have completed wrapping each piece of yarn around the center, cut off any excess. Finally, tie a small bow at the top of the pompom to finish it off.