Calvin has come in from the cold and removes his outer clothes, including his hat. His hair is flattened in some places and sticking out in others. He knows this and as he walks past Hobbes, he says, "I know I have hat hair, so you don't need to tell me." Hobbes says, "Actually, it's not that different."
https://cdn.mastodon.org.uk/media_attachments/files/111/807/755/778/977/839/original/4d4fe30802ff4910.gif