Twirl this banana around your thumb
Visit Taiwan some day. Honest. Every school kid twirls and twirls during class.
This cool video teaches you different ways to spin a pencil/pen on your fingers. By using your thumb, index finger, and middle finger, while observing the weight balance, you will learn to be cool...in that post-modern metro sexual blase blase...way.
Start with the pencil and the banana will follow.