A woman walks into a drug store and asks the druggist for some arsenic. The druggist asks, "Ma'am, what do you want with arsenic?". "To kill my husband." "I'm sorry Ma'am, I can't sell you any for that reason." The woman then hands him a photo of a man and a woman in a compromising position. The man is her husband and the woman is the druggist's wife. He looks at the photo and says, "My apologies, I didn't realize you had a prescription."