Felt it!

Woke up to the sound of something rattling. Initial reaction, since we live in an old farmhouse and it's been extremely windy the past few days, was, "Man, listen to that window rattle!" Quickly deduced that the sound was not the window, had just started to get out of bed to investigate, when the bed started shaking. Thought DH was having a seizure and had just reached for him when he startled awake and sat up, reaching for the cat that he thought was having a seizure. (We used to own a deaf, epileptic cat -- the response was not without precedent.)