Ahh! The joys of GTA over a serial link soon overtaken by slinging Cat5 cables out of dormitory windows and running them secretly under carpets to play red alert 2 and counterstrike!
I used to have really weird issues with GTA going out of sync.... i'd be sitting downstairs laughing my head off, having blown my brother's car up.. and he'd yell "what are you laughing at?" - and he'd be halfway across the map doing something totally different
Now, Duke Nukem 3D games via modem... they cracked me up! Especially the F-key taunts you could spam