It was time for the annual blood drive. told his girlfriend, “I’m going to give blood .” She said, “Don’t do that. You could get disease.” He asked, “I could get a disease? could I get a disease?” She said, “You know. What if a nurse trips and stabs with a dirty needle?” He said that was . Nurses don’t trip. Nurses don’t stab blood donors dirty needles. He went to the blood drive next day. He watched the nurses carefully. None them tripped. None of them stabbed a blood with a dirty needle. He gave blood. He his girlfriend that no one had tripped and him. She said he was lucky this time.