Final Fantasy X: The Secret Buster Sword
Unknown to many, a Buster Sword exists within the FFX game files, but is not used anywhere. This means that the only way to get it is with hacks.
Interestingly, Tidus attacks with the blunt edge of the sword, just like Angeal Hewley and Zack Fair (the sword's original owners). An intriguing Easter egg, I must say.
I used FFXED to get the Buster Sword:
http://forums.pcsx2.net/Thread-FFXED-...
Hi-res picture of the FFX Buster Sword:
http://finalfantasy.wikia.com/wiki/Fi...