I like this question, I had to think hard about it, because the 80s were my growing-up years.
On a different day, I might think of a different thing and give a different answer. I was a little kid when the 80s started, and when it ended I was leaving school.
On the last day for the final-year students, it was a tradition to take over the school assembly and have a rock concert. Somehow, I got singled out to be the lead singer for that concert. I was a bit of a comedian, I had no inhibitions about making a fool of myself in public, so the kids organizing it decided that I was an ideal choice... which came as a surprise to me, as I had always thought they hated me.
So we did a couple of Sex Pistols songs, and I shouted my lungs out and sprayed whipped cream over the front 5 rows of the assembly. It seemed to go down well. In retrospect, I didn't quite understand the difference between punk and metal at the time.
And that experience, and rehearsing for it, got me interested in playing guitar... something that would shape the next decade of my life.
That was 1989, just within the bounds of the 80s. Right now, it's the favorite memory that I remember, but there may well be something else from the 80s if I thought about it longer...