http://consumerist.com/2007/09/26/health-organization-kaiser-permanente/

Health organization Kaiser Permanente has launched an online game for kids that teaches them about nutrition and healthy lifestyles, then “locks” the kids out of the game after 20 minutes so they’ll go outside and play. We imagine the lock-out functionality won’t be needed, as the educational aspect of the game should organically repel the target audience of 9- and 10-year-olds in 10 to 15 seconds. [Reuters]