When the X-Files series was on TV some years ago, I only liked the episodes that had aliens and UFO's in them, as the rest were just boring gory murders and stuff.
So I bought the boxed set (below) and now I can choose to only watch the alien/UFO episodes which i've made a note of on a piece of paper..
(PS- for the record only about 50 of the 218 episodes are aliens/UFO's.
I also bought the separate 2 full-length films.)
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Below- a couple of stills from the series-
Mulder sees poor Max being abducted up to a UFO-
Mulder and Scully investigate a spooky farming community, but on their final visit find them gone, and only a crop circle remains-