From the guys over at CouponSherpa.com, who have selflessly scanned menus nationwide, here are the toughest food challenges you can subject your stomach to...

In the ancient battle of Man vs. Food, e-sportbooks and restaurants are betting on Man. For example, BetED.com recently posted odds for the epic "Nathan's Hot Dog Eating Contest," held every 4th of July.

Of course, Nathan's isn't the only place to find gourmands gorging themselves for fame, glory and free food. Amateur gluttons and the restaurants that serve them are found across the country. We researched 40 gut-busting restaurant challenges for those seeking free food and entertainment. A couple words of advice: Don't fill up on bread, and remember foods dunked in liquids slide down easier.

And if you scope out any ringers, let us know so we can call our bookie.

1. Denny's Beer Barrel Pub
Location: Clearfield, Pennsylvania
Food Challenge: If you have two people and three hours, take on the Beer Barrel Belly Buster. The 15-pound burger includes a 20-inch patty, 17-inch bun, two onions, a head of lettuce, 25 slices of cheese, three tomatoes, mayo, mustard, relish and ketchup. Finish the challenge in three hours and it's completely free. If you can't finish the burger, it'll cost you $49.95.

2. Jack 'n Grill
Location: Denver, Colorado
Food Challenge: As seen on the Travel Channel's popular "Man vs Food" show, the famous Jack-n-Grill seven-pound burrito eats more like a casserole than a burrito. Women who complete the challenge receive free food for life at Jack 'n Grill. Only three women have ever finished the challenge and word on the street is they never returned for more.

3. Papa Bob's Bar-B-Que
Location: Bonner Springs, Kansas
Food Challenge: Finish the Ultimate Destroyer -- a giant 12-inch sandwich with a half-pound pulled pork, half-pound hickory-smoked sliced pork, and two slices of bread -- and Papa Bob's will refund your $45 entry fee.

4. Pizza Party
Location: Santa Clara, California
Food Challenge: Eat one Belly Buster 20-inch pizza with cheese and two toppings in one hour or less. Unlimited water is included with the pizza, however you may not dip your pizza into the water (or any other drink). You have to keep down all the pizza and clean up your mess if you vomit. Finish and you'll receive your entry fee back (equal to half the cost of the pizza), a T-shirt, your picture on the wall of the restaurant, and a free extra-large pizza every month for a year.

5. Beau Jo's Pizza
Location: Colorado
Food Challenge: Finish a Grand Sicilian Pizza made of 12 to 14-pounds of hamburger and sausage on a loaded 16-inch thick crust pizza. You and a friend will have one hour to complete the challenge. If successful, the pizza is free and you'll receive $100 and two free T-shirts.

6. Pho Garden
Location: San Francisco, California
Food Challenge: Step up to eat three large bowls of "Pho Garden" combined in one massive bowl. This meal contains two-pounds of noodles and two-pounds of beef. If you succeed within the 60-minute time limit, the meal is free and Pho Garden will place your photo on their Wall of Champions.

7. Lucky's
Location: Chicago, Illinois
Food Challenge: You have one hour to finish three sandwiches in Lucky's Sandwich Contest (roast beef, pastrami, corned beef, Capicola, smoked turkey, ham, Cajum chicken, The Fredo, The Two Bagger or Salami plus toppings). Finish and receive the third sandwich free, a T-shirt, and your photo on the Wall of Fame. Finish in 30 minutes to receive all sandwiches free.

8. Big Pie in the Sky
Location: Kennesaw, Georgia
Food Challenge: Take on the Carnivore Challenge with a friend to eat an 11-pound pizza in one hour. If you follow the rules and succeed, you'll receive $250 (or $200, since the entry fee is $50).

9. Seiad Valley Store and Cafe
Location: Seiad Valley, California
Food Challenge: Chow down on the Pancake Challenge. If you manage to eat all five-pounds of pancakes (with syrup and butter) in two hours, your meal is free. Currently only seven people have managed to get through this amazing amount of pancakes in 15 years.

10. The Big Texan Steak Ranch
Location: Amarillo, Texas
Food Challenge: Try to take on the Texas King. A 72-ounce steak (four pounds) with buttered roll, shrimp cocktail, salad, beans and potato. If you succeed, you will be one of 7,000 who have completed the challenge in the past 50 years. The meal is free if you're able to finish, but costs $72 dollars if you leave anything on your plate

11. Clinton Station Diner
Location: Clinton, New Jersey
Food Challenge: You and three friends can try to mount the 50-pound Mt. Olympus Burger in three hours. It's free if you finish.

12. Gus and Paul's
Location: Springfield, Massachusetts
Food Challenge: Eat the Worlds Biggest Corned Beef Sandwich at Gus and Paul's. It contains 2.5-pounds of corned beef, one-pound of swiss cheese, two sliced tomatoes, half a head of lettuce, 1.5-pounds of water roll, half-a-pound of mustard, one-pound of sliced pickles, one-pound of coleslaw, and 1.25-pounds of French fries. Finish this giant sandwich in an hour or less and it's completely free.

13. Bang Bang Pizza
Location: Norwalk, Connecticut
Food Challenge: This challenge requires you finish a 22-inch Sliced Pie with two toppings in just 30 minutes. You may not consume any beverages during the competition. Finish and receive one free pizza per month for a year, a T-shirt, and your name on the Wall of Fame. Fail and you'll pay for the pie and forever face your picture on the Wall of Shame.

14. Kooky Canuck
Location: Memphis, Tennessee
Food Challenge: We dare you to try and eat the entire Kookamonga Burger. This monstrous burger includes four-pounds of ground chuck, two-pounds of bun, 1.5-pounds of lettuce/tomato/pickle/onion/and cheese totaling 7.5-pounds of food with optional fries. You'll need 26 hours of aerobics to burn of this whopping 12,387 calory burger. Finish in 60 minutes and it's free. Kooky Canuck also will post your picture on their Hall of Fame. Fail and you'll pay for your burger plus see your face on the Hall of Shame.

15. Pig n Chik
Location: Sherwood, Arkansas
Food Challenge: Attempt to finish the Sarge Burger in 30 minutes or less....a feat only accomplished by one person to date. This burger contains four-pounds of burger, a one-pound bun and plenty of fixings. Finish in less than 30 minutes and it's free.

16. Red Devil's Pizza
Location: Granada Hills, California
Food Challenge: Finish a 28-inch pizza between two people within a half hour. Finish the pie and receive a gift certificate for two additional 28-inch, four-topping pizzas and Red Devil Pizza merchandise. After every 20 winners, there will be a drawing for a $500 prize. (You must be at least 16 years old to enter this contest.)

17. LW Pizza
Location: Long Beach, California
Food Challenge: LW Pizza dares you to eat an entire in less than one hour. No fair using the bathroom or throwing up during this hour-long challenge. Finish to receive $100 cash, a $100 LW Pizza Gift Car, and your money back for the challenge pizza.

18. Big John's
Location: Redondo Beach, California
Food Challenge: Finish a 32-ounce burger in under 60 minutes and it's free. This challenge has only been completed once in 1,825 attempts.

19. The Broken Yolk Cafe
Location: Throughout California
Food Challenge: If you love breakfast, why not try the Broken Yolk Cafe; Special? This dozen-egg omelet includes mushrooms, onions, American cheese, and a slathering of chili and cheese. It also comes along with home fries and two biscuits. Your breakfast is free if you finish in one hour.

20. Bokampers
Location: Plantation, Florida
Food Challenge: Swallow The Beast. You have one hour to devour a three-pound burger with eight slices of bacon, four slabs of cheese, four farm-fresh fried eggs and French fries! Finish in time and the burger is free. Bokampers' also will post your picture on their Wall of Fame.

To see the other 21 belly-breaking challenges, click here.