HOBBES: Have you an idea for your story yet?

CALVIN: No, I’m waiting for inspiration. You can’t just turn on creativity like a faucet. You have to be in the right mood.

HOBBES: What mood is that?

CALVIN: Last-minute panic.

Bill Watterson (b. 1958) American cartoonist

Calvin and Hobbes (1992-05-21)
    (Source)