"Negative" Calorie Foods

So there are foods out there that are supposedly "negative" as in you burn more calories eating them then they are actually worth. Some people say it's bullshi*t but hey...Snopes says it it's true so I believe it...at least the celery! http://www.snopes.com/food/ingredient/celery.asp

Vegetables
asparagus, beet, broccoli. green cabbage, carrots, cauliflower, celery, chile peppers (hot),cucumber, dandelion, endive, garlic, green beans, lamb's lettuce, lettuce, onion, papaya, radishes, spinach, turnip, zucchini

Fruits

apples, clementines, cranberries, grapefruit, lemon, mango, orange, pineapple raspberries, strawberries, tangerines