The Speed of Light and Intelligence

The humor comes from a play on the word 'bright.' It uses the literal meaning of light being fast and then relates it to intelligence. The joke implies some people seem smart until they reveal their lack of intellect through speaking.

• Light
• Sound
• People
• Speed
• Hearing
• Brightness

• You say to your slow friend: "Damn, you're slower than Stephen Hawking!" And that takes some talent.
• What’s the difference between being a genius and being an idiot? Being a genius has its limits.
• What runs faster than Stephen Hawking in his wheelchair? His Internet.
• What’s one thing smarter than Stephen Hawking? His computer.