Whether you’re a designer trying to get a mobile layout pixel-perfect, a frustrated customer needing to document some strange behavior for the folks at the Genius Bar, or a wordsmith wanting to memorialize your latest Words With Friends achievement, you’re going to need a screenshot. Luckily, every portable iOS device has a super-simple way to capture whatever’s happening on your screen. Simply push the sleep/wake and Home buttons simultaneously, and you should see the screen flash, accompanied by the familiar camera snap sound—provided your device has a built-in speaker. This trick works anywhere in the OS—including when an app is running—and you’ll find the resulting image in your Camera Roll, where you can access and share it just like any other photo you’ve snapped.