http://www.youtube.com/watch?v=KFWcv15KKyk

I've posted this before but if you're not familiar with who Jason Becker is, he was one of two guitarists in the band Cacaphony, along with Marty Friedman. Deen was also the drummer in that band for a short time. Anyway, Marty Friedman went on to join Megadeth and Becker joined David Lee Roth's band to record his album "A Lil' Ain't Enough". Just before the recording of the album, he was diagnosed with ALS (Lou Gehrig's Disease). He was able to finish the album but rapidly began losing the ability to move his fingers, hands, arms, etc., to the point where he lost the ability to move everything except his eyes.
He is a true inspiration. According to doctors, he should have passed away several years ago from this disease but, last I knew anyway, was still alive and composing music using a computer via eye movements.
Here's a documentary on his life...Well worth the 20 minutes if you've got a few to spare.
http://www.youtube.com/watch?v=OFjQgDe_a0E