Even though I was expecting it, it still made me worry for my health for a second.
The only problem is that the screen is pretty much static when it's shaking. If you type, you won't actually see the letters until the shaking stops. I guess Earthquake just takes a snapshot of the screen and displays that in a full-screen window, so there's probably nothing the developer can do without doing some really advanced hacking. Oh well. It still gets the job done. (The job being to make the user a little bit nauseous.)