The joke: What happens if someone slaps you at a high frequency? It hertz The breakdown: two words that sound identical but have different meanings: - "Hurts" (causes pain) - "Hertz" (unit of frequency, named after physicist Heinrich Hertz) The setup: "What happens if someone slaps you at a high frequency?" The punchline: "It hertz" — which sounds like "It hurts" when spoken aloud.