When someone talks or uses a cellphone during a movie at the Alamo Drafthouse, they are booted from the theater. They believe that those actions disturb other moviegoers and ruin the theater experience. Most theater chains won’t implement this kind of rule and choose to play out some generic and non-threatening clip asking patrons not to use their cellphones.

But a London theater called The Prince Charles Cinema is taking this rule to the next hilarious (and potentially dangerous) level. They have volunteer ninjas dressed in all black bodysuits watching over the theaters looking out for any kinds of disturbance. When they do find one, they give disturbance to the one ruining the movie experience.

/Film has found someone who has experienced this for themselves, and it looks like The Prince Charles Cinema ninjas are effective.