Murder Party

Christopher, a lonely meter maid, finds an invitation to a Halloween party titled Murder Party on the street. He constructs a cardboard knight costume and decides to attend. He makes his way from the street to Brooklyn to join the party.

Christopher arrives at a Halloween gathering in Brooklyn, only to discover it's a trap set by deranged art students. They intend to murder him as a piece of art to impress a patron and obtain a grant. The group is in costume and calculating, waiting to enact their plan.

The art students — Paul, Macon, Sky, Lexi, and Bill — outline their plan to kill Chris as a performance piece. Alexander arrives with Zycho and his dog Hellhammer, revealing Zycho is his drug dealer. They all debate who will do what and the overnight plan to wait for the witching hour to strike.

Sky reveals an allergy to non-organic raisins after tasting Chris's pumpkin raisin bread and collapses from the revelation. She dies after hitting her head, and the group hides the body out of embarrassment.

Macon leaves to fetch pizza; Alexander has sex with Lexi and then with Paul during the chaos. Macon returns, becomes drunk, and accidentally sets himself on fire. Chris notices the blaze while Paul starts taking photographs.

The group turns to Sodium Pentothal for a 'truth serum' game. They all take a shot from the same needle, except for Alexander, who injects his dose into a slice of pizza. As secrets spill, they press Alexander about the grant.

After the truth serum, the group learns that Alexander is not a real grant recipient but a fraud; he is a fry cook planning to kill them and steal their art. Lexi helps extinguish Macon's burning, and Zycho heads out to fetch crank on Alexander's orders.

Paul injects Alexander with truth serum, and the group questions the grant again. Alexander's deception is exposed, and the room erupts into violence. Paul is shot in the head but doesn't realize it, annoyed that someone interrupted his shot. The assistant is shot as Zycho attacks Lexi; Macon, badly burned, uses a chainsaw to kill Zycho and then passes out.

Lexi is killed by Bill with an axe as the chaos continues. Bill then finishes off Alexander with a baseball bat and begins hunting for Chris.

Macon awakens and pursues Bill with an electric chainsaw to avenge Lexi, and the chase leads them to an art student party.

Inside the art party, Bill murders all the artists while Chris hides in a performance art exhibit. Macon arrives and finds an outlet to plug in the chainsaw, then falls off a roof while trying to use it. The powered chainsaw remains outside a window, and Chris seizes it to defend himself.

Chris uses the chainsaw to bring Bill down, then places a pumpkin on Bill's destroyed head and screams that he just wanted to party. He escapes the scene and dials emergency services, insisting this is real and not art.

Christopher disposes of his anti-anxiety medication and returns home. His cat Sir Lancelot greets him as he sits in his blood-soaked knight costume and turns on the TV to process the night's events.