They must have forgotten their squat cars had dash cams...
Some guy walks over to a plant in a public place and takes a shit. Its caught on video.
99% of population is dead after world nuclear war. Survived animals mutated. No plants, no trees, no oxygen remain on Earth. You got a viable seed - it's time for ressurection. Kill mutants, upgrade your gun and increase skills to grow the plant.
That's a whole lot of tumbleweed. There was no more room to tumble.
BMX accidents dont get much more painful than this. Time for a new nose and some teeth.