Now be honest, how many of you in a blind taste test can taste the difference between ordinary Coke and ordinary Pepsi?

老老实实,你们谁能在不知道的情况下尝出,可口可乐和百事可乐的不同

耶鲁公开课 - 博弈论课程节选

Anyone? How many times can you tear a 4 billion page phone book in half?

谁知道？,40亿页纸每次对半撕，你能撕多少次？

哈佛公开课 - 计算机科学课程节选