Sign up for Pizza Hut's email list and they'll send you a coupon for free breadsticks, cinnamon sticks, or cheese breadsticks ($1 fee) when you order online. Click the link in the email, select which one you want, the total will come out to $0.00 and you can check out so no other purchase is necessary.
Sign up here:
If you're already signed up to receive emails from them you'll need to use a new email address.
Gmail users: check your spam folder for coupon.