This is a five-minute two player demos on a user-made deathmatch level.
You'll need to download the level-- cdrom.com oughtta have them, and it's
a good level anyhow: GUN_Q2.BSP.

Stick the level in quake2\baseq2\maps and stick the demo in
quake2\baseq2\demos.  From the console type "demomap gun_q2.dm2" (minus
the quotes).