Copyright laws can be enforced even against non-commercial misuse. For example, people widely share copyrighted material (videos, music, software, etc.) online with no intention of profiting from it, and the copyright holders will still often respond with and succeed in legal action.
Yeah, I recognize SpongeBob (though I’ve only seen one or two episodes, and probably not even the whole episode(s)), but … I don’t get it. Yeah, I’m that blonde guy to whom you have to explain e-ve-ry joke