The first few “Karen” videos were funny, especially as a distraction while living through a pandemic. But as time went on, I fantasized about confronting them. Then, one day I realized that this was less about defending another person, and mostly so I would feel like an ally. As a white man, I could instigate conflict and violence, but it wouldn’t end well. I wanted more people like me to have this realization. So, I made a tense thriller showing how quickly an encounter between a diverse group of young people and a Karen can go from funny to horrific.