Tremors are currently being monitored underneath Seattle and the Puget Sound area. Experts believe this is part of a "slow slip," according to reports, which is fairly common. You know, tectonic plates rubbing against each other?

However, actors Kevin Bacon and Fred Ward believe all this rumbling activity is due to Graboids. Graboids are giant subterranean snake-like critters that travel underground as fast as a shark can swim through the ocean. They have tentacles that grab you by the leg and pull you into their slimy mouths and swallow you whole. Only large-caliber rounds or small-to-medium sized explosives can kill them. But it's probably just the slow slip thing.