Smiley (2012)

The titular Smiley killer is the subject of an Internet myth. Supposedly, if a person types "I did it for the lulz" three times on a Chatroulette-style website, a killer called Smiley (who had his eyes stitched shut and his mouth carved into a smile) will murder the person the user is talking to before the user themselves.

College students Ashley and Proxy are roommates. At a party, Ashley meets Zane, Mark, Crash, Kells and Binder.

One night, Ashley and Proxy test out the Smiley myth with a random person. After typing "I did it for the lulz" three times, they witness the stranger's murder. Proxy convinces Ashley to stay silent. However, Ashley begins experiencing guilt, and believes Smiley is stalking her and intends to kill her, which her friends and a psychiatrist write off as anxious hallucinations and nightmares. Ashley eventually tries to convince the police to investigate the murders caused by Smiley. The police dismiss her.

When Proxy loses contact with Zane, she video chats Ashley in hysterics. Ashley goes to Zane's house only to find him shot dead with his own handgun. Ashley picks up the gun and orders Proxy to type "I did it for the lulz" three times, hoping to summon and kill Smiley. However, she accidentally shoots Binder, who had come over to check on her. Moments later, Smiley appears and slits Binder's throat. Ashley is then attacked by multiple Smileys before throwing herself out to her supposed death.

It is then revealed that Ashley's classmates, including Proxy, Binder, and the babysitter murdered in the opening, are all part of a fringe group of Anonymous. They created the Smiley myth as a large-scale prank, although they are satisfied with Ashley's death. Binder states that Smiley will likely live on long after them and inspire copycat killings.

Later, Proxy is video-chatting with Zane, questioning their morality. Zane dismisses her worries and types "I did it for the lulz" three times as a joke. However, a Smiley appears behind Proxy, kills her, and then waves at Zane via webcam as he watches on in horror.

In a post-credits scene, Ashley wakes up and gasps loudly, having survived her fall.