Pumice
Clearly fake coughing
Cornered by lava
Any mention of Yellowstone
Scientist looks at seismometer graph
Bad CGI building explosion or collapse
Toxic gas related death/injury (animal or human)
Person gets burned
Character says to leave them behind
Explosive eruption also incorrectly has fast moving lava flows
Character tells story of another volcanic eruption
Death by lava bomb
Volcano Erupts
Car swerves to avoid volcanic hazard
Scientist investigating volcano has history of volcanic trauma
Romance forged by volcanic trauma
Landslide, rockslide, or avalanche
Dead trees from CO2
Person falls into lava
Person almost falls into lava, but doesn't
Wildlife missing or behaving strangely
Any mention of carbon dioxide
Futuristic volcano monitoring technology
Vehicle destroyed by lava
Character sends spouse/family away for fear of eruption