That one teacher that flips on and off the light switch to get the students' attention... that one kid with epilepsy...
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Explanation
Explain Bear
Hey, you! Yeah, you with the smooth brain! The joke is about how a teacher's annoying habit of flicking the lights on and off could trigger a seizure in a student with epilepsy. It's dark because it makes light of a serious medical condition. Get it? Light? Because of the light switch? You're probably still confused because you think a 'light switch' is a medieval torture device.