Oldest and favourite would be playing Secret of Mana with my brother when it first came out (still my favourite game to date). Next in line would be weekend all-nighter sessions of Champions of Norrath and it's sequel with a good buddy of mine.

Apparently I'm not the only one who fondly remembers Secret of Mana... awesome!

Left 4 Dead

World at War Zombies

Call of Duty Zombies before Black Ops 2's shitty ass Zombie mode (excluding Mob of the Dead and Origins) hit. If they threw all Zombie maps into one game with updated visuals to match current PS4/XB1 visuals it would be an instant buy. this needs to happen, please Treyarch and Activision, PLEASE!!!.

You're all young fools for not saying (any) Bomberman and Turtles in Time!

mine is prob with Contra/BattleToads/Double Dragon. Used to play these all the time with my older brother

Turtles in Time and Secret of Mana as a kid.

3D World recently was insane, that's why it's still my favourite Wii U game.

Playing both Splosion Man games online with a friend and trying to get all the cakes and shoes, each game has unique multiplayer levels and they were really fun and frustrating sometimes, a lot of eureka moments.

As for local, playing various beat em ups and TMNT games over the years, a lot of fun. Not competitive but do enjoy games where we work together.

Oh, most definitely Star Wars Rebel Strike: Rogue Squadron III. The game included the co-op mode of Rogue Leader I think, and that mode was the shit. Split screen action, having to do different tasks like shooting down tie fighters, escorting the frigate and what not, it was  a ton of fun - good times.

Played it with my brother till the cows came home.

TimeSplitters 2

Streets of Rage