During the late 80's early 90's, in Mexico there was this horror TV series named "La Hora Marcada" (The Marked Hour) in which every episode had a different plot, similar to Twilight Zone/Night Gallery. Actually quite a few of big names in Hollywood today started directing and writing episodes for that series (Cuaron, Del Toro Etc), so the quality of the show was big.
The only connective tissue between episodes was this terrifying woman dressed in black that appeared randomly during the episode, invisible to the characters, just kind of a watcher or bad bad omen or harbinger in the background , representing death:
This Woman in Black really fucked me up as a kid, i used to imagine that she was in the corner of the room watching me before i turn up the lights, or watching my house from outside and that if i take a peek at the window during the night i will see her there standing watching my house. Hell sometimes i still imagine this, really fucked me up for some reason.