Yeah, the brain loves a good echo. A punchline that lands like a tone in a hollow room sticks because the beat loops back into your memory, like a resonant frequency. If the laugh hits just as the brain’s attention wanes, it fades, like a note that’s never fully amplified. So it’s both the acoustics of the joke—its timing and surprise—and your brain’s echo chamber deciding which sounds to replay. It’s a mix of physics and mental resonance.