A man and a woman were waiting at the hospital donation center. Man, "What are you doing here today?" Woman, "Oh, I'm here to donate some blood. They're going to give me 500 bucks for it." Man, "Hmm, that's interesting. I'm here to donate sperms, and they are going to pay me 2500." The woman looked thoughtful for a moment and they chatted some more before going their separate ways. Several months later, the same man and woman meet again in the donation center. Man, "Oh, hi there! Here to donate blood again?" Woman: [Shaking her head with mouth closed] "Unnh hunhh."