"Carlin Robinson, 12, walks from her grandmother's car to the school bus in Manchester, Ky. Her house can be seen in the background. A study published in 2010, investigating high obesity rates in the town found that residents used cars to minimize walking distance, to the detriment of their health." Association != causation. While the picture this caption is from is indeed ridiculous (grandmother driving her daughter…
"Overweight people have a tendency to sit, while lean ones have trouble holding still and spend two hours more a day on their feet, pacing around and fidgeting, researchers are reporting in findings published today.
"The difference translates into about 350 calories a day, enough to produce a weight loss of 30 to 40 pounds in one year without trips to the gym - if only heavy people could act more restless, like thin ones."
....
"The director of the study, Dr. James Levine, an endocrinologist and nutritionist at the Mayo Clinic, said the findings offered hope to overweight people, suggesting that relatively simple and painless changes in their daily behavior, like making an effort to walk more and ride less, could help control weight."
Source: http://www.nytimes.com/2005/01/28/health/28weight.html
I picked this one because it's the NY Times and Science, but there are numerous other sources available via Google.