A figure appears in shadow and then walks into light. 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.