Clueless myself, "An earthquake?"sputtered from my mouth, as thoughts of Armageddon rattled through my brain.
It stopped as suddenly as it had started. I headed immediately to the best source for immediate information that I know, Twitter, and received confirmation that it was indeed an earthquake and had registered a 4.3 magnitude (It's now been adjusted to 3.8.).
It's not unheard of to have a n earthquake in IL. We do sit on a rather large, mostly inactive, fault line. A year or 2 back, there was a small one that was I awake for and still didn't feel. The neighbors did and it registered somewhere like 1.8. It made the news top story because it is such a rare event and I never would have known about it otherwise.
So, all in all, it made for a few minutes of excitement and with no damage involved, I can say it was kind of fun. Now to hope for aftershocks!