You're Next (R)

In You're Next, three killers crash a family reunion in a remote mansion wielding a variety of weapons and start picking off people one by one. The murderers have thought of everything: a cell phone jammer so their victims can't call for help; a booby trap of fishing wire stretched outside the house's front door, ready to decapitate anyone who tries to make a run for it; spooky animal masks to startle and taunt their prey. They even have a catch phrase, the film's title, which they like to write...