At first glance it might not seem that President Obama and kid-rocker Justin Bieber have much in common. But both men had just a tad too much altitude going through the doorway of aircraft and - boom! the celebrity noggins got a good crack while the paparazzi snapped photos.
Yep, it is fun to put America's president and its most adorable heart-throb together in the same sentence and call them klutzes, but there's more to the story.