Recharging Laptop From Plane Headphone Jacks?

krow asks: "So every flight I get on I wonder, could I partially recharge my laptop off of the headphone outlet? What about using alligator clips to the recharger for the airphone? Anyone else have some creative ideas? How much juice do you think you could pull before tripping a breaker?" Well, this was a fun question for once. I've always wondered the same thing but figured the current/voltage would be insufficient for anything more than a trickle charge, if even that. Anyone have any clues? Or better yet ... anyone have alligator clips for those wacky Airphones?