I remember seeing Evil Dead 2 in the cinema. I got the strangest looks when I laughed my head off.
You'd think they'd never seen a headless man in a nehru jacket before.
If Back To The Future 2 has a problem is that it just isn't confusing enough.
In the third film I would have had Marty have to go back to The Enchantment Under The Sea dance and try to avoid both other versions of himself, only discover almost everyone there is him a la Let's Go To Golgotha!.