Nugget & Sweet Pea do that to me all the time. Lately they haven't done that, thank God. I even have little scars all over my hands/fingers from them attacking me.

I think it is either because I scarred them, or they didn't like the intruder (my fingers) coming into their home/territory.

I started to dip my finger into baby food, just a little bit, and then when I went to grab them, they got a tasty treat and found my fingers to be a good thing.

They haven't bitten me for about a month or so.