Don't worry, Jake isn't really strange at all. One of my cats and several of my parents' nine cats do this. I'm not completely sure of the reason. I read somewhere that some cats have very sensitive skin that can become irritated from very little petting. I also heard that certain cats are just too excitable and can't sit still when they're given loves. As long as he's playing and doesn't seem agitated it probably isn't a problem. When he becomes really upset then he may need a break from touching. With my biter, I try not to pet in one spot for too long. (Out of curiosity... is Jake Siamese, because I heard they're more prone to this behavior) Good luck saving your hands. PS. If the biting is just a problem because its painful for you, try wearing a mitten or soft oven mitt. These feel good to the cat and they can bite them as much as they want. I even saw a fuzzy mitten in the cat toy section of my local Petco just for this.
My cat does that. I'll just be petting her and she's purring and everything is fine and all of a sudden she'll snap at you. In fact, my fiance saw her do this for the first time the other day. They just get overstimulated b/c of their sensitivity. Don't worry, it's just his way of telling you he's had enough.:vampireL: