Police grabbed an 18-year-old suspect for committing three robberies inside an NYU dorm near Union Square Monday and Tuesday. Juan Molina, not an NYU student himself, allegedly got away with four laptops, two iPods, a digital camera, a necklace and a credit card by walking right into students' rooms without even having to force his way in. He just waited for opportune moments to duck in rooms at the Carlyle Court building near 16th Street, robbing one student while they were taking a shower. But after using the stolen credit card at a nearby drug store, cops identified him by the description of his red hair after having Molina on record for a burglary last year. NYU sophomore Brittany Barnard told the Post, "It's not that surprising. People leave their doors open here. I used to leave my door open all the time—but not anymore."