Garry's modis a "physics sandbox" for Half life 2, you can spawn all sorts of props & ragdolls, and do all kinds of fun stuff. For instance... This... Thing I made:
It drives & uses balloons to keep the majority of its mass to keep it from dragging...
And DOG is the driver/disco dancer on top
If you have HL2, be sure to pick this up, it's a fantastic mod. (you can purchase the newest version of it for 10 bucks from steam, and it looks really fun too, but I am not buying it until after Portals comes out so I have more new stuff to play with)
Btw, it has a multiplayer feature to it, thats what Hamachi is for (creates no config VPN)
