What stories or jokes have you read or written that changed the course of things in one sentence?

In physics class, the teacher talked about "safe use of electricity". In the anxious atmosphere of summer, nearly half of the students in the class are sleepy. I was sleeping at the front desk when the physics teacher called his name. I kicked his stool, and he just rubbed his sleepy eyes, staggered to his feet and yawned a lot, which made a group of people laugh. The teacher was even more angry. "Answer this question. The mouse bit off the wire, and the current was too large due to non-human factors. What should I do? " I just wanted to remind him to "turn on the circuit breaker", but the next second I was choked by his answer for a long time. He sincerely looked at the physics teacher-Ann ... using a mousetrap.