Demolition Man has a ridiculous amount of campy yesterday's-tomorrow-today humor value. It contains the best acting performances that Sandra Bullock and Rob Schneider have ever put on, as they are playing cheesy futuristic keystone kops, a perfect match for their acting skills. And hey, how can you go wrong with the warden from Shawshank Redemption as the chief kop? Of course, Stallone and Snipes finish off the comedic acting crew. I don't think the movie's supposed to be all that funny, but I find it hilarious.
(I wonder if this movie inspired Futurama...)
Edit: At the time, the humor value of "President Schwarzenegger" was much lower than it is today. However, Taco-Bell-everywhere was funnier then than it is today.