Harry's scar hurts when looking at Snape because Quirrell's turban, hiding Voldemort, is facing directly at him.
Film/Series: Harry Potter and the Philosopher's Stone
Category: Foreshadowing
Timestamp: 00:46:12
During the opening feast, Harry experiences a sharp pain in his lightning-bolt scar while locking eyes with Severus Snape. The audience is led to believe that Snape is the villain causing this reaction. However, observant viewers will notice that Professor Quirrell is sitting right next to him with his back turned to Harry. The scar is actually reacting to Voldemort's face hidden under the turban, setting up the film's ultimate plot twist right away.
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