A lady walked into a drugstore and told the pharmacist she needed some cyanide right away. The pharmacist naturally was concerned by such a request and asked, "Why in the world do you need cyanide?"

The lady then explained that she needed it to poison her husband. The pharmacist's eyes got big and he said, "I can't give you cyanide to kill your husband! That's against the law! I'll lose my license¹. They'll throw both of us in jail and all kinds of bad things will happen! Absolutely not—you cannot have any cyanide!"

The lady reached into her purse and pulled out a picture of her husband in bed with the pharmacist's wife.

The pharmacist looked at the picture and replied, "Well, now. You didn't tell me you had a prescription²."