Calvin and Hobbes by Bill Watterson for March 15, 1988
Calvin: This book says tigers are solitary and secretive creatures. Hobbes: True. Very true. Calvin: Secretive? Hobbes: Oh, sure! You wouldn't believe some of the secrets I know. Calvin: Really? Like what? Hobbes: I can't tell you. They're secrets. Calvin: You can tell me! I won't blab! Honest! Tell me! Please?? Hobbes: Big secrets! Secret secrets! Boy, if you only knew! Mm-mm!