Halo on the original Xbox. LAN parties. 3 Xboxes, 4 players on each, blood gulch snipers only. Those were the days.
Or to go really far back, Goldeneye 64. Oddjob not allowed.
We still from time to time will break out some Halo for split screen gaming. Setting up matches with low gravity and using only rocket launchers and gravity hammers makes for a hilarious time.
Also spent a lot of time on Goldeneye back in Jr High. Nail gun & proximity mines all the way. I tried to play Perfect Dark when they released it on the newer consoles which has a similar setup to Goldeneye and it was really hard to play now, lol.