I remember a few from various stages of my life (born 1984).
Seeing the demo footage of Sonic 2 in Woolworths and thinking the leaves falling down in Aquatic Ruin zone was so cool and advanced.
The original Sega arcade of Virtua Racing with the moving cars completely blew me away.
I remember my uncle loading up Cannon Fodder on his Amiga, and a REAL song with REAL music came out, along with REAL photos. I was amazed haha.
A few years on I remember a PlayStation demo disc having promo footage of the first Gran Turismo and it looked so real to me, I watched it over and over. The first Driver on PS1 looked absolutely amazing to me also.
I come from the ZX 81, Spectrum, C64 and Amiga days….I made a lot of music on C64 and Amiga, but for gaming?
Borderlands 2 with 3 friends battling Vermivorous the Invincible, everyone on life support and hanging on to their teeth and after a long struggle defeating it. Once in a lifetime.