Geyser explosion in Yellowstone National Park causes tourists to flee.
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https://www.youtube.com/watch?v=Z64etOuLZDQ&feature=youtu.be
https://youtu.be/Z64etOuLZDQ
https://youtu.be/Z64etOuLZDQ
causes tourists to flee
.... after a three second delay to realise boiling-mud-rain may be slightly unpleasant