Prescription?

A lady went into the pharmacy and said to the pharmacist, "I want to buy some cyanide.

The pharmacist asked, "Why in the world do you need cyanide?"

The lady replied, "I need to poison my husband."

The pharmacists eyes got big and he exclaimed, "I can't give you cyanide to kill your husband! Murder's against the law! I'd lose my license! They'd throw both of us in jail!
All kinds of bad things will happen. Absolutely not! I will not sell you cyanide!"

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

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