Calvin and Hobbes by Bill Watterson for February 21, 1995
Calvin: I wonder why people are never content with what they have. Hobbes: Are you kidding? Your fingernails are a joke, you've got no fangs, you can't see at night, your pink hides are ridiculous, your reflexes are nil, and you don't even have tails! Of course people aren't content! Calvin: Forget I said anything. Hobbes: Now if tigers weren't content, that would be something to wonder about.