We got the Surface Duo from Microsoft last month, but we weren’t allowed to do the old flex test. Now that the device has been released into the wild, YouTuber Zack JerryRigEverything Nelson tested it in one of his infamous durability videos, and the results are a bit surprising.

The Surface Duo may be an expensive phone that most people probably shouldn’t buy, but that doesn’t mean it’s exempt from the trials and tribulations other devices on Zack’s channel have to go through. While the scratch test is nothing new (it’s Gorilla Glass 5, so “deeper grooves appear at a level 7”), the crease test reveals an unexpected result.

The Surface Duo is a very slim device compared to other folding devices, and that thinness shows – the phone flexes more than Popeye after a can of spinach. But despite having a plastic frame, it manages to hold together. How? Thanks to the well-crafted metal hinge that is strong enough to hold your entire two halves. Still, I wouldn’t recommend sitting on the Surface Duo unless you want to own the world’s first foldable phone with a permanently curved screen.