About learning jokes

Yu Qian didn't study hard when he was a child. If he didn't get good grades, he would go home and often mess with his father.

His father bought a lie detector...

One day, Yu Qian came back from the exam and his father asked: How many points did he get?

Yu Qian: 90.

Beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beep, beng beep, not beep, the lie detector will beep.

His dad asked: To be honest, how many points?

Yu Qian: 80.

Beep beep beep beep... it rang again.

His father was anxious: To be honest, how much does this unlucky kid score?

Yu Qian: 70.

Beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep... the lie detector is still beeping.

His father was so angry that he was shaking all over: Tell the truth! ! !

Yu Qian: 40...

Dudududududu...

His father couldn't bear it anymore and said: You have wasted all my hard work. Why don't you learn from me? I remember when your father and I scored 100% on every exam...

Bang... the lie detector exploded