Unstoppable opened to $8.1 million on Friday which was good enough for first place – barely. The PG-13 thriller is the fifth film pairing of Denzel Washington and director Tony Scott, and the second in a row to feature a runaway train as its dramatic centerpiece. Though projections indicate that Unstoppable will be anything but a runaway hit, the film should at least match the $23.4 million opening weekend of Denzel and Scott’s last train thriller, The Taking of Pelham 1 2 3. Too bad that won’t be enough to outsmart Megamind. The 3D comedy came in second on Friday with $7.9 million and is poised for its second weekend at number one thanks to higher ticket prices and a general lack of interest in this weekend’s other new titles. That includes Universal’s Skyline which debuted in fourth on Friday with $4.7 million on its way to a weekend in the $14 million range – a far cry from this week last year when 2012 earned $23.4 million on its first day alone. Finally, Morning Glory opened early to get out of the way of all that testosterone. It didn’t help. The romantic comedy’s Wednesday-Thursday gross stands at just $2.6 million and its Friday take of $3.1 million was only good enough for fifth place.