It was quite a big deal to have a Video back then, because I am now an old bastard, and this was at a time when not everyone had one. So I used to look forward to visiting.
There were two videos I always wanted to watch. One was Flash Gordon, and the other was Tommy. This particular memorable sequence freaked me out in a pleasantly uncomfortable / uncomfortably pleasant way, and it never quite rinsed out of my head. Weeks later, I always wanted to watch it again to make sure I'd actually seen what I thought I'd seen. I watched it again recently, and it still gave me that same tinfoil-under-the-wrists sensation.
(Warning: there is fake blood in this, and ludicrously oversized syringes.)