Once Einstein was on his way to deliver a speech to university students. His faithful chauffeur not only drove his car, but was always present amongst the audience during all his speeches. Einstein had delivered this particular speech so many times that his chauffeur had actually memorized it. On that day Einstein, while on his way to the university, said aloud in his car that he felt tired. So his chauffeur suggested that they change places and that while he delivers the speech, Einstein could drive them back home. Their identities wouldn’t be a problem because Einstein wasn’t more than a university professor then and so no one in that university would recognize him. So he agreed but was a little thoughtful about what his chauffeur would do if he was asked any difficult questions by the students, after the speech. However, the speech went well but Einstein’s thought came true. A student came up with a question. Here’s what the chauffeur said “Why, that question’s so simple, that even my chauffeur can answer it.” And so Einstein stood up from the audience and easily answered the question, much to the amazement of the audience.