Smarkus and Company (1982)
This obscure, made-for-TV special from 1982 sports some of the cheesiest (and, frankly, terrifying) computer graphic effects, generic (and sometimes horrifying) synthesizer music, and even some nightmare fuel for your viewing pleasure.
Unfortunately, there isn't a YouTube link of the entire video. But, here are a couple of links to give you an idea on how badly this short needs a riffing.
And not for the faint of heart:
Drew Curlee commented
One of the links no longer works. So, I am posting this link in its place: https://www.youtube.com/watch?v=MwD4vXOPrGk