Here's a Japanese emergency gadget, like the ones from Eton. It has a handcrank that can power a radio, cellphone charger, or the LED flashlight. And it has a sensor that'll detect 4.0 quakes or higher, and set off a siren and flash some lights. (In case you didn't notice your house falling around your head.) The sensor will likely detect if you jump on the bed, too. Seems like a crock. But a cool crock.
Earthquake gadget [Tokyo Mango]