Facebook Co-Founder and CEO Mark Zuckerberg has a cameo role in Terms and Conditions May Apply, a documentary about Internet security and privacy, but Zuckerberg didn’t even know he was being filmed, Director Cullen Hoback told AFP, as reported by The Telegraph.

According to Hoback, he approached Zuckerberg outside his home in Palo Alto, Calif., while holding a video camera, asking him, “Do you still think privacy is dead? What are your real thoughts on privacy?”

Hoback told AFP Zuckerberg asked him to stop filming, and referred him to Facebook’s public-relations team, but Zuckerberg did not know Hoback was wearing spy glasses, which continued to film their conversation.

The director added:

I just wanted him to say, “Look, I don’t want you to record me,” and I wanted to say, “Look, I don’t want you to record us.”

I think the craziest thing about this whole experience is that I didn’t realize I was making a horror film.

Readers: Are you interested in seeing Terms and Conditions May Apply?