Correction.

I am not the only one in the house who felt it.  I'm just the only one on two legs.

The cats apparently felt it.

Mika was still out of sorts forty minutes later when I herded the Fries upstairs for naps.  Small Fry went to collect her piggy from where she'd left it on our bed, and Mika actually lowered his ears and hissed at her, clinging to his cozy spot on the bed.  (Usually, he'd just jump up and skitter away.)