E= MC²

When Albert Einstein was making the rounds of the speaker's circuit, he usually found himself eagerly longing to get back to his laboratory work. One night as they were driving to yet another lecture, Einstein mentioned to his chauffeur that he was tired of speechmaking.
"I have an idea," his chauffeur said. "I've heard you give this speech so many times. I'll bet I could give it for you." Einstein laughed loudly and said, "Why not? Let's do it!"
When they arrived, Einstein wore the chauffeur's cap and jacket and sat at the back of the room. The chauffeur gave a beautiful rendition of Einstein's speech and even answered a few questions.
Then a pompous professor asked an esoteric question about anti-matter formation, digressing here and there to show off his expertise. Without missing a beat, the chauffeur fixed the professor with a steely stare and said, "Sir, the answer to that question is so simple that I will let my chauffeur, who is sitting in the back, answer it for me."