I was there for this one. For such a big band, Fishbone was musically precise. Just impressive and made me a fan, had never heard of them before. Beasties, not so precise, but that was their deal then.
Also was at the aforementioned Ozzy show in 86. Dropped acid. Don't remember Metallica opening. Could be because I was outside trying to trade mexican dirt weed for tickets with the acid just kicking in. I seem to recall Ozzy putting on a good show.
I actually have a reverse experience, Quiet Riot opening for ZZ Top in like 83? I'm not from Texas, had not yet attended UT, and this was pre-MTV so ZZ Top was basically one of those bands you heard every so often on the local classic rock station. Quiet Riot comes out, it was basically their first tour after getting popular, so you could tell they were having a great time and the show rocked. I was thinking this would be the first time I saw the opening band outperform the headliner. Well...you know how this ends. ZZ Top comes out and just blew the doors off that notion.