While some makeup is easy to repurpose (lipstick on cheeks or blush as eyeshadow), you probably only use mascara the traditional way — on your lashes. One swipe for definition, a few extra coats for drama, and that's about it, right? Wrong. Turns out there's a totally unexpected brow hack for your mascara, and we've got a tutorial that breaks it down. In the next episode of Face To Face with Microsoft, our VP of production, Kate Hyatt, gets the scoop from YouTube beauty vlogger Casey Holmes. The trick to transforming your mascara into brow gel is all in the application, which happens to be pretty goof-proof. No spoilers here, though — click play to watch Kate turn her brows into model-worthy arches.