Older woman goes into the pharmacy.
"Yes,said the pharmacist, How can I help you?"
"I want to buy some quick acting poison which will kill humans," says the woman.
"What, replies the pharmacist?
Woman: "I want some poison which will kill humans."
"My husband is having an affair, and I want to kill him."
"Madam, I cannot sell you poison just so you can kill your unfaithful husband."
Woman pulls out a photograph showing her husband in bed with the pharmacists wife,
"Ahh, said the pharmacist looking at the photo. "Why didn't you say you had a prescription?"