He Shall, from Time to Time - S1-E12
C.J. Cregg: What are you taking?
President Josiah Bartlet: I don't know. My wife hands me pills, I swallow them with water.
Sam Seaborn: Sir?
President Josiah Bartlet: Vitamin C, Vitamin B. Is it possible I'm taking something called euthanasia?
Sam Seaborn: Echinacea?
President Josiah Bartlet: Ah, that sounds more like it.
Chosen answer: A really annoying innate lack of sense. My friends and family say the same thing all the time, and I'm endlessly trying to correct them. I think people just don't know any better and (ironically) couldn't care less that they're speaking incorrectly.