The National Park Service complained about a television advertisement in which an actor dressed as a park ranger is asked how Old Faithful's eruptions are kept so regular, and he is shown pouring Metamucil into the geyser. A Park Service spokesman warned of the dangers of approaching hot springs and geysers and said the ad "suggests that it's okay to pour some substance into a thermal feature." As a result, the ad will henceforth appear with the following caption: "Dramatization—please obey Park Service rules."

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