I don't have GMod, but my friend does. He made a "Hampster Ball of Death" and apparently it's invincible so whenever he makes it he gets banned from the server lol :P.
Me n friends make a base on the construction zone in one of the houses, then spawn massive waves of zombies that directly attack us.. lol its chill game
It's a game that takes most steam games (half life, counter strike, etc...) and allows you to use chars and maps from those games... Then you can make items, spawn items and CPU's, and have epic battles, or just fool around and do sh't all with ur buds... cool game