enigma star
This is cool...um
ninja
would it be possible to throw a kunai to a wall leaving a huge hole?
I curious to know...I know for sure for a katana it does
sweatdrop

It would really depend on the metal the kunai was forged with, how strong the wall was (whether it was made from wood, stone, etc.), and the thickness of it..
The speed of the kunai as it hit the wall would make a considerable difference as well. A kunai that was thrown by a person would less likely penetrate... If it was shot from a sling, cannon, or whatever (not sure if ninjas invented a device to shoot kunais), it could make considerable damage to the wall or break into pieces if the metal was imperfect.
I would assume in most cases that wouldn't be possible....