Watch Selena Gomez get scared (twice!) on ‘Ellen’

Selena Gomez loves a good scare so much that she and boyfriend Justin Bieber recently visited Knott's Scary Farm — an L.A.-area theme park better known as Knott's Berry Farm that transforms itself each year for the Halloween season and features costumed actors doing their best to frighten crowds. Talk show host Ellen DeGeneres, who chatted with Gomez for an episode of "Ellen" that airs Friday, decided to have a little fun with this fact. While Gomez was revealing her favorite part of the park — the mazes — Ellen arranged for a masked-wearing man with a chainsaw to sneak up behind Gomez. Check out her reaction!