Funnily enough, I do. I was helping to wire up a radio studio. I had my Grundig C8800 stereo radio cassette with me. We were a bit stunned to hear something so bold and left field from the one man in the band who's made little impact as a writer before. Some liked it, others not, but everyone was surprised.
There is no way I could remember my actual first hearing of it, but it would have been at home in Newcastle NSW before I left for university in Canberra. But... 'how could I ever forget' and I never did. And then I finally after so many years got to see him perform it.