I always used to joke that I'd drop a fart of such power and magnitude that the world would turn to dust
So far it's only the smell that disgustingly deadly. Still gotta work on the power of it
If it doesn't happen that way I think at some stage everyone on earth will fart, maybe even fart and burp at the same time which would probably cause the earth to explode.
The coolest way for the world to end were if it were a transformer like Unicorn (from Transformers of course
) and started battling other planets. We would all basically be fleas on it.