A college physics professor was explaining a particularly complicated concept to his class when a pre-med student interrupted him.
“Why do we have to learn this stuff?” the frustrated student blurted out.
The professor ignored him and continued the lecture.
A few minutes later the student spoke up again.
“So how does physics save lives?”
The professor stared at the student and finally responded to the student.
“Physics saves lives,” the professor said, “because it keeps the idiots out of medical school.”