Garry's Mod is a Half Life 2 physics sandbox mod. In short, you can do anything you like. Want to try building a catapult? Go right ahead and make one. Not good at building? Spawn ragdolls of your favourite HL2 characters and place them in silly poses. Still no fun? You could always try spawning a few hundred zombies and battling it out in a duel to the death! At the moment it's a retail game, but it doesn't cost too much ^^
So, anyone messed around with this? I'm on my laptop at the moment, awaiting my new desktop to arrive but when I get back into the groove I'm probably going to try making a few defensive contraptions (To protect potential emergency food supplies from the impending threats of zombies, headcrabs, ravenous Excels etc.
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Feel free to post screenshots of any contraptions you might have made, or just discuss recent developments of the mod. (For one, I'm totally looking forward to the full release of Orange Box content to play around with in GMod.)