A woman walks into a pharmacy and asks the pharmacist for a bottle of Arsenic.
The pharmacist asks her what she wants the Arsenic for, and she tells him she wants to poison her husband.
He tells her he can't sell it to her because he could lose his business or possibly wind up in jail.
The woman pauses for a few seconds, then reaches in her handbag and pulls out a picture of her husband and the pharmacist's wife naked in bed together and hands it to the pharmacist.
He looks at it for a few seconds and says, "Ohhhhhhhh . . . Why didn't you TELL me you had a prescription ?"