That's not a knife... THIS is a knife I tried to post the image, but my usual host isn't having a good day. But you GOTS to check this thing out.
Kill Bill is only a movie. I repeat, Kill Bill is only a movie. You cannot board planes with Hattori Hanzo souveniors.
It was probably destined to be on somebody's wall in their game room. I doubt anybody would actually use that as a weapon.
That thing looks too cumbersome to actually use as a weapon. I'll take a single-bladed 25 cm knife over that thing if I'm in a fight.
I wouldn't put it on my wall, but I know big nerds who would. Its the same folks that would buy into all that United Cutlery crap they have on QVC.