Click Here for the promo code to rent a Redbox DVD for free. It's only good for today (Wednesday). You can use the promo code again if you use a different credit card at the time of rental.
If you sign up for their e-mail updates you can also receive a promo code for free Redbox DVD rental every Monday.
Nothing like a free dvd to perk up your Wednesday.
Edit: For those of you who haven't used Redbox before. It's like a DVD rental vending machine usually found in drug stores and supermarkets. Normally, the cost is $1/night. You use your credit card to charge the purchase. You may return the DVD to any Redbox vending machine.