Superman is the ultimate aspirational figure—the strongest, fastest, most idealistic being on the planet. Children everywhere wanted to be like him. Pajamas bearing his symbol were a status symbol in American households, shorthand for wanting to channel his power, his morality, his invulnerability. The logical hierarchy of the Superman meme universe places him at the apex: he has no equal, no rival, no superior.

Then this fact inverts that hierarchy with perfect elegance. It suggests that Superman, that paragon of power, doesn't aspire to be like other men. He aspires to be like Chuck Norris. The pajama imagery is crucial: it's intimate, it's personal, it's the thing you wear closest to your body. Superman sleeps in the hope of becoming Chuck Norris. That single reversal—placing another human above the most powerful fictional character ever created—is the entire joke.

What makes this work is its economy. It's three short sentences, a perfectly constructed syllogism of escalating dominance. Everyone else wears Superman pajamas because they want his power. Superman wears Chuck Norris pajamas because he wants his power. The fact doesn't explain what Chuck Norris can do; it doesn't need to. The implication is absolute: if Superman aspires to be him, then Chuck Norris must transcend fiction itself.