In the particular instance of the person in line being too busy talking on her cell to place her order, I think that is probably poor etiquette... however, I do believe that at least to some extent Internet addiction is a real malady. I mean, how many of us have not gotten the shakes when the Internet connection is down for five or six hours? How many stories do you hear about people forgetting to eat because they are absorbed in an online game?

News - Child dies as parents play WoW // PC /// Eurogamer

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The best way to learn anything, is to question everything.