Everbody needs to go to this website and try this stupidly awesome thing. It's pretty ******** spectacular. It's the Spore Creature Creator which is merely a fraction of an entire game developed by the same guy that created The Sims. To sum up the game in two words is simple: Sim Everything.
The demo is about 25 percent of the parts in the actual game, Spore, but it allows you to build a super wide variety of creatures and play with them. It's so unparalleled and so innovative I'm sure it'll be the next big thing on PC.
If you want to know more about it then look it up, but I suggest you TRY TRY TRY IT!