Re: Rollerball
I love Rollerball. I remember seeing it (or at least some of it) when I was way too young to understand the meaning, and thinking that riding round on motorbikes giving people on roller-skates a ride looked an awful lot of fun.
So me and my brother re-enacted it the following day. That is we took turns to wear the roller-skates or be the one pulling on the bike (Raleigh Chopper since you ask) - not that we ruthlessly slaughtered our rivals for profits and the entertainment of baying crowds.
If you pedal really hard, then quickly turn the bike at the last minute before the skater lets go, of the hoop on the back of the seat you can get a fair turn of speed on the skates. And it's a lot easier to pedal with some extra resistance on the bike than to get up to those kind of speeds on skates alone.
I liked the film for different reasons when seeing it as an adult. The Running Man is also mostly great.
And my favourite bit of Robocop was the TV adverts. "Nuke 'em! The game for all the family to play."
It's funny to be an adult in the 21st Century. Living at the time predicted by so much of the scifi I read as a teenager - and to notice how much it got wrong.
Almost everything under-estimated the ubiquity of computers and overdid the speed of progress in space tech.