“Aliens. With lasers.”
“Global warming.”
“Increased gravitational energy.”
“Misreading the Mayan calendar.”
“Fluoride in the water.”
“Widespread, simultaneous half-suicide.”
“Bear pox.”
“Mutant bees.”
“Bunnies. It could be bunnies.”
“Radiation. From comets.”
“Radiation. From frogs.”
“Space polio.”