MAD Magazine "It's A Super-Spectacular Day/ Mad Super Special Summer 1980" (MAD, 1979)
Yanked from the comments section, a totally cool anonymous reader has uploaded ALL EIGHT ENDINGS to the "MAD Mystery Sound" flexi "It's A Super-Spectacular Day"! Copywritten to 1979 but released with the 1980 Summer "Super Special", this marvel of engineering would play a random ending with every spin of your turntable thanks to the multiple grooves that it had allsmashedalongsideeachother. Like tons of other looney kids, when this came out I was obsessively driven to hear (and in my case, record) all eight endings, resulting in the song being lodged v-e-r-y d-i-s-t-i-n-c-t-l-y in my head, no doubt for life. Playing all 8 MP3s in a row can really only minimally replicate that experience (maybe if you do it about 70 times at random before you allow the final version to complete you'll get close), but I guess since time is so much more valuable these days than it was 26 years ago it's all for the best.
Thanks again to the reader who added the files!