Dexter actress Jennifer Carpenter says that she finds her serial killer on screen brother much scarier than the bloodthirsty murderers she has to face in new horror film Quarantine.

“I guess I’d have to say Dexter because he puts up this front of being normal,” MSN quote Jennifer, who plays Dexter’s sister Debra Morgan as saying.

“He does it very well and because he does it so well and I meet so many people on a day-to-day basis that appear to be normal, you always wonder what’s going on at home for them. It makes you think twice about honking at someone who’s sitting at a green light because god only knows what’s going on in their brains!”