There was the woman who approached the local pharmacist and asked for cyanide.
“What on earth would you want to do with cyanide?” he asked.
“I want to poison my husband” she said coolly.
Of course the pharmacist was quite upset about this and made it quite clear to her that he was not going to be part of such a plot, and that he had no intention of selling any poison to her for that purpose.
The woman then took a photograph out of her bag. It showed the pharmacist’s wife in bed with the woman’s husband.
“Oh! You didn’t tell me you had a prescription!