Soren Kierkegaard, the renowned Danish philosopher and humorist, spent his days brooding in this very lair.
Little did anyone know, he was secretly a fan of knock-knock jokes.
Visit our Philosophy of Jokes subpage for more on the existential implications of a well-crafted punchline.
Or, if you're feeling particularly existential, head to our Existential Crisis subpage for a healthy dose of absurdity.