The new PSone and PS2 have a new feature which instantly voids your lifetime warranty if you remove the casing?
It's a sticker covering the final screw to the case, if pealed back it will permanetly imbed the word "VOID" onto the machine.
Even if you peal it back a little, the sticker instantly changes and the word "VOID" comes up.
Playstation wont touch you if its void.
Thats all...
btw. Played a ps2 the other day, and its sweet