When you hand someone your phone to show them a picture, you should be able to trust them not to go swiping through your camera roll. But we live in a fallen world. And the worst violators of phone-borrowing etiquette are older relatives and in-laws -- the same people who'd be most horrified to see your nudes or, so much worse, your 20 selfie outtakes.
You can either dedicate your life to meticulously organising your photos into folders, or continue keeping everything in one big camera roll, and follow this tip from Reddit user Ennui92.
Just zoom in a little on the photo before you hand over the phone. When the snoop tries to swipe, they will just awkwardly bounce the picture around, buying you enough time to grab your phone back. The experience will further cement their fear and distrust of technology, but at least your endless reel of rejected profile pics will remain your dirty little secret.