Three turtles decided to have a cup of coffee.
Just as they entered the cafe it started to rain.
The biggest turtle said to the smallest turtle, "Go home and get the umbrella."
"I'll go get the umbrella if you'll promise not to drink my coffee."
"We promise," answered the other two.
Two years later, the big turtle said to the middle-sized turtle, "Well, I guess he isn't coming back, so we might as well drink his coffee."
And then they heard a little voice from just outside the door, "If you do, I won't go."
两年了，这雨也该停了吧......