Back then there wasn't to many horrors that was scary as the Exorcist.
I was fifteen or near abouts when i first saw Exorcist, never forget it, I was staying at my grandmothers for the weekend, decided to go see Exorcist so walked to the movie cinema in town, its about a 3 mile walk up an old abandoned railway track with rusted old train carriages clanging in the wind, nothing unusual walked up that track plenty of times but after seeing the Exorcist & not in the right frain of mind, plus it was night time pitch black and windy infact i was freaking out, dang I got to walk home!
That 3 mile walk back home was complete hell every carriage i walked past i would take a quick glance inside just in case there was some demon in there waiting to pounce! The loud CLANG of the carriage doors knocking against the sides did not help! I would turn around nervously convinced their was something behind me, whats that shadow? CLANG! Jump!
Later i had to do the same with Alien, that was worse, walking home in the dark after seeing alien - CLANG! Jump!
Now i can sit through Exorcist and not even flinch.