Dangerous encounters

POV: You encountered; Nothing; A tree; A speeding car heading straight for you; A speeding train; A grizzly bear; A truck coming straight for you; A runaway train; Any wildlife in Australia; A wildfire; Radiation; A serial killer; 100 cans of radiation; A bomb; A nuclear bomb; 10 nuclear bombs; 100 nuclear bombs; Siren head; Hell; Pennywise; SCP 173; SCP 096; Pennywise's true form; A demon; A ghost; Satan; A supernova; A neutron star; A hypernova; A preon star; A black hole