In case you haven’t heard of it before Half-Life 2 is one of the biggest PC video games ever released. In part due to the physics engine that VALVe has implimented.
Well a mod creator by the name of Garry Newman has given you a chance to play with the physics of HL2 with “Garry’s Mod” as of this writing it’s in version 4a.
Gary’s Mod allows you to pose characters, tie objects together, shoot various props out of your RPG.
I reccomend that any fan of the game give it a try so head on over to Garry’s webpage Here