Men in Black
For a silly little blockbuster, there are two excellent quotes from Tommy Lee Jones (K). They're part of the same monologue, but on two related topics.
"A person is smart. People are dumb, panicky, dangerous animals and you know it."
"A thousand years ago, everybody knew as a fact that the Earth was the center of the universe. Five hundred years ago, everybody knew that the Earth was flat. And fifteen minutes ago, you knew that humans were alone on it. Imagine what you'll know tomorrow."
La, la, la - la - la - la....