I gave blood with them a lot during college, as did my brothers. Then we moved out. For probably about eight years after I moved across the country they would s

I gave blood with them a lot during college, as did my brothers. Then we moved out. For probably about eight years after I moved across the country they would still call my parents' house. "Hi, is Luca there?" "No, he doesn't live here anymore. Please remove him from your list." "Okay." Thirty seconds later, the phone would ring again. "Hi, is Duncan there?" Repeat a third time for my other brother. For years. I think it's stopped now, so it didn't quite last a decade (though maybe it did for my older brother). The Blood Center of Central Texas, on the other hand, stopped calling the first time I asked them to. Once they stopped, I resumed donating regularly. All that aside, I highly recommend donating blood regularly--it has health benefits and is a pretty effective form of charity.