In fact, he and Teller host a blood drive - Penn & Teller's 13 Bloody Days of Xmas - every year.
SkeptiLove asked him if there's a particular reason why he donates blood so often.
Take a page from Penn's book and donate blood. You can use this helpful search site to find a blood bank near you.
I do it because it's a good thing to do. I'm also bone marrow typed, they asked me why I wanted to get that done and I was perplexed, 'To help?' I said. I guess most people don't think about it until someone in their family needs it. I said, 'I want to help some violent crack whore with my marrow.'
Also, if you missed my Warning Radio interview when it aired live, don't worry! You it has been uploaded, and you can listen to it now.