The University of Bergen's seismometer recorded vibrations when Norway scored goals at the World Cup.
Nobody actually knows if thirty thousand people synchronized their jumping with precision physics, or if a sensitive instrument simply happened to spike when everyone was watching the same screen.
A seismometer exists to detect earthquakes. When it detects anything else, the default assumption is that it's detecting something real in the world, not something real about the apparatus.
The deeper omission is that nobody has asked whether this matters. The Millennium Bridge in London famously swayed under pedestrian footsteps, but only because the sway itself caused people to synchronize their steps in feedback. A system instability, not a flaw in human nature. Bergen's seismic spike might be entirely harmless, but nobody checked.
A seismology department gets a story out of a quirky observation, and a city gets harmless folklore. By the time it might matter, infrastructure risk stays invisible — not denied, but unmeasured.