Let's see:

• WoW back when I had friends that played and a decent guild
• Playing pretty much every co op game with my best friend that we could find.
• Trying to beat the last level of Halo at 3am while having way too many energy drinks and one of us always managing to fuck something up while driving the warthog
• Playing Crota's End raid in Destiny 1 blind with my friends when it came out and trying to get through the maze with the lamps
• That summer me and my girlfriend were both unemployed and we played hours and hours of Dungeon Defenders

Everyone either has kids now or travels too much or just isn't interested in playing anymore. It's sad those days are probably forever over for me now. Maybe once we're all in nursing homes there will be a resurgence in lan parties, instead of bingo for our generation.