A woman enters a pharmacy and asks for arsenic ... - What are you planning to do? asks the pharmacist, suspicious - It's to kill my husband ... - What? You're kidding! I can not sell you anything to commit murder! Very calmly the woman then opens her handbag, and takes out a picture of her husband sleeping with the wife of the pharmacist ...
- Ah, of course, said the latter, if you have a prescription, it's different ...