Thats my arm. You should go give blood. They say if you give you save three people's lives. Platelets, plasma, and blood. You literally empty yourself for someone else. :) Could there be a more Christian thing to do?
Of course if you have ice water in your veins, no one wins. Except really thirsty people.
That is, btw, some guy who dipped his fingers in ice water and took a picture of his chilled veins.