A lady walks into the drugstore and asks the pharmacist for some
arsenic. "Ma'am, what do you want with arsenic?" "To kill my husband"
replies the lady. "I can't sell you arsenic to kill a person!"

 

The lady lays down a photo of a man and a woman in a compromising position. The
man is her husband and the woman is the pharmacist's wife. He takes the
photo and nods. "I didn't realize you had a prescription!"