Scratch Off Stickers-an incentive for your business and a Facebook Promotion

Kay Green at MyPreciousKid., the leader in child safety products , is using our scratch off stickers to create her own scratch off cards. She is instructing her Facebook fans to call their order in and they'll receive a special surprise. This is generating excitement among her fans as well as instant gratification with receiving a coupon code in a fun interactive way.
When I heard this, I thought what a great idea! It's a way to reward her current customers and get to interact with them at the same time. When her customer calls in an order, her assistant chooses a scratch off card and scratches it off to reveal a discount. The result is an excited customer who is excited to have won something and got it at a discount.
How will you use scratch off stickers in your business?