The tech we all take for granted can be weaponised in surprising ways to cause real harm to real people. In recent years we’ve seen a disturbing increase in popular platforms and smart devices being exploited to harass, surveil and threaten already vulnerable people, because these products aren’t built with their safety in mind. It’s not that developers don’t care about their users, it’s just that most of us would never imagine our products being misused in these ways. This talk explores how we can design and test for these unimaginable threats, so that we can all make technology safer for everyone.