I remember this, myself, so it must have played in Montreal (or maybe just on one of the upstate New York network affiliates, like WPTZ Plattsburg).
Yakov Smirnov’s poignant and haunting vignettes about the horrors of the Soviet state, which were often run between saturday morning cartoons. (Right after the Honeycomb commercials.)
“Heh Heh Heh!” ::Sniff:: Such a brave, brave soul…
After that, I suppose, I’ve always had a fond place in my heart for the public literacy ads that’d come on after some holiday specials. (Garfield, and the California Raisins, if I remember right. Maybe Charlie Brown, too.)
Lorenzo Music…if you’re out there, somewhere, I will visit my local public library!
There was one that I would love to see again about registering for the Selective Service (the Draft, if you didn’t know). All these hip (white) 80’s guys, dressed kind of like Michael Jackson, strut on down to the Post Office to register… and then celebrate their success by break dancing. Poifect.
Drugs drugs drugs,
some are good, some are bad.
drugs drugs drugs,
ask your mom or ask your dad!
and not exactly a PSA, but a Church of Latter Day Saints ad about how lies snowball and turn into bigger lies. I can’t remember the tune for the life of me though.
Showed in CT and Pennsylvania as well… I don’t have time to search for it but my “We were children once and young” thread has a link to this commercial (and it really brings back memories).
From memory. 
I didn’t know that played only on Long Island. The rest of you missed out. That ad was awesome.
Heh. There was one I saw once about how you shouldn’t trash-talk your mother behind her back. “Treat your mother–treat your mother right.”
There was another personal favorite that started out with a kid walking down the street. He fell down. Other kids laughed at him. Then it shows him walking down the street. He falls down again. He hides the trip by breakdancing. Everyone thinks he’s cool. Yeah, right.