A woman walks into a drug store and tells the pharmacist she wants to buy some arsenic. He says, "What do you want with arsenic?" She says, "I want to kill my husband because he cheats on me by having sex with another woman." The pharmacist says, "I can't sell you arsenic so you can kill your husband, even if he is having sex with another woman." She reaches into her pocket and pulls out a picture of her husband having sex with the pharmacist's wife. The pharmacist says "Oh, I didn't realize you had a prescription.