I was there. Bought my Metallica 'Metal Up Your Ass' t-shirt and took it back to South Wales and none of my friends had any idea who or what Metallica was.
T-shirt was electric chair on the front / toilet seat with knife blade coming out of it on the back.
Getting into '80's fashion i chopped the sleeves of it.
That was one of the best Monsters Of Rock line-ups ever