What game made you buy your system?

[Shaggy]

Some people like to buy the new systems just for the fact that they are new and want to be one of the first people to get it. On the other hand there are some people that didnt care to get one. Then one day they heard about some game that was coming out on it or a game that was already out on it and it made them want to buy the system. If you fall into that catagory then post here the game that made you want to buy one of the new systems that are out and if you regret making the purchase or not?

Reasons I got these-
PS2-Grand Theft Auto 3
X Box-Halo
Gamecube-Legend Of Zelda: Windwaker