In a dark future, a deadly plague sweeps across the land. It kills indiscriminately. No one really knows where it came from, but a few old men with sombre faces remember old tales about gifs being uploaded into bacteria. Gifs became memes. It wasn't long after that the pestilence struck. Maybe mankind had gone too far and this was their punishment.
A man starts coughing violently in the corner.
Another man swears loudly, "Oh shit!", recognising the tell tale signs.
The others in the room realise they're already dead. The coughing mans face turns green as he contorts in his death throes. The last whisper from his bloodied, split lips:
"Here comes Dat Plague."