I was born in '72, so I don't remember seeing Ep. 4 in the theater (I need to remember to ask my Dad if he ever took me). I definitely remember seeing Ep. 5 in the theater, mostly because of the scene of Han being tortured (him strapped into that chair that had sparks going off), partly due to the carbonite and "Luke falling out the bottom of the city" scenes.

BTW, what's proper etiquette on post replies? I don't want to be seen as rambling on pointlessly. :)