A Very Scary Story

It was a dark and stormy night... just before Halloween as Ren sits and watches a horror movie alone. She gets a terrifying "I know you're home alone" call from someone, but it turns out to be Louis, dressed in his penguin jockey outfit.
At school the next day, Ren is the only person not dressed in a Halloween costume. Instead, she is encouraging all the students to get eye examinations, which are being given by Principal Wexler and Coach Tunut, who are looking and acting suspiciously like Dr. Frankenstein and Igor. Meanwhile, Louis has plans for the greatest Halloween prank ever, eyeballs in the turkey gravy. But by lunchtime, his cohorts Tom, Tawny and Twitty have flaked on him. They've all taken the eye exam and are now drinking milk and talking and acting responsibly, like Ren. In fact, everyone now is looking and acting the same way. When they take their dark glasses off--they're missing their eyeballs!
Louis runs down the hall in terror trying to escape, surrounded by zombie-like

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S02E14 - Sadie Hawkins Day