Lift up your foreskin with both thumbs, and peel backwards over the shaft of your penis.
Slip a ruler inside the tip of your penis. Follow with a finger, then push your entire fist inside. With a little bit of effort you should be able to extend this to your forearm, and then work up to getting both arms completely inside the penis.
You should now resemble a wheel.
Roll around town crying deeply and make the occasional racist remark.