A woman walks into a pharmacy. "I have a headache," she says. "Do you have anything to cure a headache?" "Paracetamol," says the pharmacist. "And I have a sore throat," the woman says. "Do you have anything to cure a sore throat?" "Paracetamol," says the pharmacist. "And I just feel so unhappy all the time," she says. "Do you have anything that cures depression?" "Paracetamol," says the pharmacist. "Paracetamol cures depression?" the woman asks. "If you take enough of it, it does."