] The National Park Service is fuming over a commercial in
] which a park ranger pours a glass of Metamucil into Old
] Faithful in Yellowstone National Park to help the geyser
] stay regular.

i smell a lawsuit.

they go on to explain that venturing near thermal features is dangerous, and "In 2000, a summer employee was killed and two others were severely burned when they jumped into a thermal pool thinking it was not especially hot".