Three Guys on a Plane

There was a Korean guy, Japanese guy, and a Taiwanese guy on a plane.  There were three weapons on the plane: a knife, a gun, and a bomb. While they were passing Korea, they accidently dropped the knife. When the Korean guy got home, he saw his mother crying. He asked her why. She said, "Because a knife fell out of the sky and killed your father!". While they were passing Japan, they accidently dropped the gun. When the Japanese guy got home, he saw his mom crying. He asked her why. She replied,"Because a gun fell out of the sky and killed you father!" While they were passing Taiwan, they accidently dropped the bomb. When the Taiwanese guy got home, he saw his father and mother laughing. He asked why. His mother replied, "Because when your father farted, the whole house blew up!"