We could all die from a massive earth fart

While not likely, some scientists think so:

Ryskin published a paper in 2003 titled "Methane-driven oceanic eruptions and mass extinctions" in which he theorized that "mass extinction"can be caused by an extremely fast, explosive release of dissolved methane," an eruption that would release "deep anoxic waters that cause extinctions in the marine realm," with extinctions on land brought about by "explosions and conflagrations that follow the massive release of methane" and by "eruption-triggered floods."