Did you feel that? Relax, you're not the only one.
An earthquake – and a relatively strong one at that – shook the Philadelphia area and beyond Thursday afternoon and sparked a social media firestorm.
The 4.1-magnitude quake originated just off the Delaware Bay coast near Dover.
The largest earthquake to hit Philadelphia in recent memory was in 2011, when a 5.8-magnitude quake centered in Virginia throttled the city and was felt from Georgia to Canada.
Users from New York to Washington, D.C. took to social media shortly after the shake.
Here's a quick look at some of the reaction:
There were, of course, some who poked fun at the response from the East Coast, which isn't too accustomed to this sort of thing.