Fainting at school due to a ball in the face or something, and then awakening in the infirmary as if it wasn't serious. Neither an hospital nor emergency service is called, even parents are not informed. After all, your crush is at your side so nothing can happen to you.
It's just a plot twist to be alone with someone else during class hours without truancy. And it's so fucking stupid, anything else can do the job better, so why ?