An envelope is shoved under a door. The lights go out, grow dim, or flicker menacingly. A flashlight beam is seen. Take one drink for EACH flashlight beam seen. Somebody experiences missing time.
Someone is killed by a monster.
Any character who was killed re-appears. Includes hallucinations, flashbacks and shape-shifting aliens. The hit team drives up to kill Mulder. Because of a government coverup all evidence of the case vanishes. Fox or Scully pull their guns.