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Nightmare Fuel: WordGirl
In the episode Victoria Best, when Victoria lost a trophy to Becky Botsford for vocabulary, her parents are disappointed and tell her to keep her eyes on the prize. Their eyes start to grow red, and so does Victoria's. Becky herself is visibly scared when Victoria was staring at her with red glowing eyes, and was remaining silent.
The part when WordGirl and Huggy fly into the screen wearing masks of each other made this troper jump in fear.