A respectable woman went into a chemists shop, walked up to the pharmacist, looked straight into his eyes, and said, 'I would like to buy some cyanide.'
The pharmacist asked, 'Why in the world do you need cyanide?' The woman replied, 'I need it to poison my husband.' The pharmacist's eyes got big and he exclaimed, 'What? I can't give you cyanide to kill your husband. That's against the law! I'll lose my license. They'll throw both of us in jail. All kinds of bad things will happen. Absolutely not. You can't have any cyanide!'
The woman 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, that's different. You didn't tell me you had a prescription.'