Lauren LaVera admits she has been “terrified” of clowns for decades. The 30-year-old actress, who battles supernatural killer Art the Clown as Sienna Shaw in the slasher film ‘Terrifier 3’, says the clown doll from the 1982 Stephen Spielberg horror ‘Poltergeist’ freaked her out and has left her scared ever since. She told Dread Central: “It’s funny because I really didn’t find it all that scary generally … but it was that one clown doll … that really messed with my brain. “And ever since, I’ve been terrified of clowns.” Discussing what makes clowns so off-putting for her, Lauren added: “It’s t…