Get a free birthday dessert -- either chocolate overload cake or New York Cheesecake - at Jack in the Box with proof of your special day. No purchase is necessary, which rocks. Print the coupon here.
Caveats: valid at participating restaurants, one per guest per visit, not valid with any other offers.
If your birthday is coming up, there are a TON more free birthday offers and deals you can get.
Free birthday dessert from Jack in the Box