Stunt car racer with a rough arsed soldered null modem cable between 2 Amigas head to head!
I remember at Uni we had a room with a bunch of Atari STs in. Got a MIDI Maze going on a couple of them using a mate’s MIDI cables (it was like a 3D multiplayer Pac-Man that networked using the MIDI ports).
Borrowed a few more MIDI cables and got a couple more talking, but was still very short on getting them all connected. So I brought in a roll of bell wire and hooked up the rest by pushing bared wires directly into the pin sockets in the MIDI ports. It worked well so long as no-one bumped the tables.
We’d take turns to be a rigger running between machines keeping them going in case any of the wires fell out, a bit like the poor kid / little brother who got lumbered with putting cars back on the track when everyone else was playing Scalextric.