Lady goes to drug store and asks for cyanide to kill her husband. She told drugest that she had caught her husband in bed with another woman.

The pharmacist said that he could not give her the cyanide because then he could be considered an accessory to murder.

The lady hands the pharmicist a note which said that the woman she had caught her husband with was the pharmacist's wife.

The pharmacist read the note and then said,"Oh, I didn't know that you had a prescription"!