I've seen a few scary,weird PSAs and "educational movies" back in the day, to be sure. The earliest one I can remember was a short doc about rabies with the rather unimaginative title Rabies, which a substitute teacher ran for us one day in the second grade and which was in my bad dreams for months afterward.
The 1970s, which was when i attended high school, was the Golden Age of 16-mm drug scare movies aimed at teenagers. At least once a year we'd get to see an informative film in science class or PE or civics, called smething like Trip To Nowhere, or The Chemical Grave, or Narcotics-The Pit Of Doom, or something of that nature which featured little vignettes like a guy allegedly tripping on acid at the zoo who felt like he was a superhero who could kick a lion's ass, and so he jumped into the lion enclosure, slapped the occupant in the jibs, and then the screen went blank with ominous music, so I doubt he made it out of that cage. There was also The Perfect Drug, which postulated that if science came up with The Best Drug Ever and it had no bad side effects....well, then we'd all be doing too much of this drug all the damn time, and terrible shit would happen to everybody as a result, and civilization would speedily grind down to a euphoric halt. Because we're just all bad like that and would most assuredly choose the quondam bad pleasant thing over the soi disant good unpleasant one. Driver's Ed at the same school prominently featured the classic, Grand Guignolesque motor morality tales cum snuff movies like Red Asphalt, Signal 39, and Wheels Of Tragedy.
Lots of anti-drugs TV spots showed throughout my youth (my main tv watching age), all designed to scare us kids away from the dope. Most of them have blurred together into a melange of frightening images and menacing voice-overs.
The Montana Meth Project and similar recent campaigns against speed usage, some of those get pretty nightmarish. Like the one where two young lads take their first hits off a meth pipe and zombie drug addicts appear out of nowhere and laugh evilly at them, or the one that takes place in a laundromat.
The anti-drug spot I recall most vividly is an out-there little mini-horror-flick of an anti-methamphetamine PSA which nobody else but me ever seems to have seen, where passersby turn into white eyed zombies and tell the strung-out POV character "They're gonna kill you" and suchlike encouraging messages, until he pulls out a pistol and....WHERE METH GOES, VIOLENCE FOLLOWS.
Lastly there are some Canadian work-safety PSAs I've seen online which just seem calculated to wake up grown-ass adults with shrieking nightmares, like the one where the young restaurant cook describes her horrific fatal accident she's just about to have with a greasy kitchen floor and a great big pot of boiling soup...and a second later, she has that fatal accident with the greasy kitchen floor and the great big pot of boiling soup, right in front of us, and it's very graphic and horrible.
The powers that be seem really fond of the idea that they can scare us all straight, don't they.