Just post stupid, creative, dumb, drug inducing, and/or somewhat reasonable ways that the world will end
Mine is that monkeys will become supreme because of a lab accident and monkeys will reproduce a lot quicker, making more intelligent beings than we could ever imagine. Then the monkeys free its counterparts that were once held in zoos. Soon they create an anti-human force that kills, tortures, and kidnaps humans. Soon, all the humans are dead, at the top of the food chain is monkeys, and the monkeys are bored with their lives. They just decided to somehow bring a huge meteor towards Earth and end all life.
The End