You are erythrocytes, you work in the body and have to deliver oxygen to everyone who lives in the body, and leukocytes that protect you from pneumonia bacteria and these leukocytes are women You are doing your job, when you want to send oxygen suddenly you meet leukocytes "What are you doing here, erythrocytes, there are lots of bacteria, now go away," `leukocytes*'said while attacking the bacteria*