Tim is a third-year student. He failed in the last exam. When he got the report card, he was very worried, because in order to let his father know about his study, the report card needed his father's signature.

On his way home, he suddenly had an idea. His father was reading a newspaper when he got home. Tim said jokingly, "Dad, can you write your name with your eyes closed?" His father smiled and replied, "well, I'll try, son." Give me a pen and a piece of paper. "

As soon as his father closed his eyes, Tim put his report card on the table with a pen on it. "Good" So his father wrote his name on what he thought was "a piece of paper.

Then his father continued to read the newspaper, and Tim was very satisfied with his signed report card.