Paranormal Activity 4 was just released on October 19, topping the US box office.
The series debuted its first film in 2009, followed by a prequel in 2010 and Paranormal Activity 3 in 2011.
Paranormal Activity follows a family who has been haunted by a demon for many years.
Katie Featherston, the franchise's protagonist, told Digital Spy that she still finds Paranormal Activity scary.
"I definitely get surprised because we filmed so much, and it's so fluid and it's so improvisation, that we never know going into it, what's going to make the final cut. So when you watch it for the first time, it is a surprise and it's fun to see what actually makes it, and it's definitely scary," she said. "I jumped a number of times watching [Paranormal Activity 4] for the first time."