found this somewhere on the net...
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
license. 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 prescription."