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1.  Eat less.
2.  Eat less.
3.  Now really eat less.
4.  Close your mouth during meals.
5.  Eat less and close your mouth between meals.
6.  Take a wonder pill and eat less.
7.  Take a wonder pill only during the day. (Only, means only a pill, not only during the day).
8.  Take a wonder pill only during the second day too.
9. And now eat less.
10. Make sport and eat less.
12. Give everybody who looks at you dark glasses. In them everything will look flat.
13. But better eat less.
14. Or close your mouth during the meal.
15. And between.
16. Drink a lot.
17. Now, drink a lot, but only water.
18. Drink a lot and eat less then in 17.
19. If everything up to here didn't help you, just forget the idea and get used to your stomach.
20-25. Reserved for slims only. When you'll reach here, we will put some text...

PS.
While looking for number 11 in this list, you'll be occupied so much that won't eat. So continue to look for it. There is possibility you'll find it. I assure that this possibility is much higher than your getting a flat stomach.