Who doesn't love a discounted meal or a buy-one-get-one-free deal, but what about a totally free meal? Sounds good, except for the fact that they are massively oversized, crazy portions that must be completely devoured in a specific time frame. These meals are not for the faint of heart, but if you think you are up for the challenge, here are four restaurants in Oklahoma where your meal is free if you can eat it all.

1. Papa Angelo's Pizzeria, Bethany

The Empire Challenge at Papa Angelo's takes their largest pizza, The Empire, and doubles the three toppings of your choice. What you end up with is a giant six-pound pizza of yumminess. You get 45 minutes to finish the giant. Everyone has good intentions, but if you can't do it, you'll get posted on their Hall of Shame, as well as on their website. Many have tried, but not that many have ever succeeded. If you can succeed, the pizza is free, you win a free t-shirt, and you will not be put to shame! Visit Papa Angelo's Pizzeria Facebook page for more information.

2. The Cow Calf-Hay, Edmond

If you're into competitive eating in Oklahoma, here's a good one. The Six Shooter Challenge Meal Consists of the 6x Cheeseburger - six 1/2 pound chuck patties, 12 pieces of American cheese, hamburger bun (dressed how you like it), full order of onion rings, full order of curly fries, and a piece of Cow Pie Cake. A soft drink, tea, or water is included during the challenge. The meal must be completed in 45 minutes and you must pay the price for the meal upfront. If you finish every bite, you will be refunded the full price of your meal. For more information on The Cow Half-Hay, visit the website.

3. Kendall's Restaurant, Noble

Come and try your hand (and stomach) at the Chicken Fry Challenge at Kendall's. To win a free meal you have to eat the following: salad, three huge original chicken fried steaks, a double order of mashed potatoes or fries, a double order of green beans, biscuit, and two cinnamon rolls. Winners get a t-shirt and a free meal. Losers get a consolation cup. Visit the Kendall's Restaurant website for more information and for the current cost to compete.

4. Fat Guy's Burger Bar, Tulsa

Fat Guy’s Burger Bar Challenge is the following: a two-pound patty, one pound of bacon (15 slices), two hot dogs, eight slices American Cheese, lettuce, tomato, onion, and your choice of condiment. All of this on a one-pound bun and don’t forget the one pound of French fries that ALL must be eaten in 60 minutes. If you can clean that platter in less than an hour, your meal is FREE! This is probably one of the biggest food challenges in Oklahoma. For more information, visit the Fat Guy's Burger Bar website.

Do you know of any other food challenges at restaurants in Oklahoma where your meal is free to add to our list? Go ahead and share them in the comments below.

Still hungry? Head to Oklahoma City and order a massive chicken sandwich at Burger Punk.