I really loved how the Playstation would come with Demo discs and how my friends and I would swap demo discs with one another just to try out new games.
Just some of my favorite titles:
Budisho Blade
Crash Bandicoot
Grandia
Intelligent Qube
Medievil
Metal Gear Solid
Spyro The Dragon
StarOcean 2
Syphon Filter
Twisted Metal 2
Unholy War
I remember being obsessed with Armor Core and Alundra about 10 years ago but not to fond of them when I replayed them a couple years ago.