An orange,an apple and a hand grenade

Three men are on a plane. They open a window and one throws an orange out. The other throws out an apple. The Third throws out a hand grenade. After getting off of the plane, they see a boy crying. They ask what's wrong, and he replies, "An apple hit me in the head!" They see another boy crying. He says, "An orange hit me in the head!" Then they see a boy rolling on the sidewalk laughing. They asked why he was laughing, and he replied, "I farted and my house blew up!"