A group of orcas off the coasts of Portugal and Spain have been causing a stir by attacking boats, with three vessels sinking in the past three years. Researchers are scratching their heads as to why these killer whales are suddenly going after watercraft. Some think it could be a new fad among the orcas, while others speculate it might be a response to a bad experience with boats in the past. Either way, it's a bizarre behavior that has experts puzzled and boaters on edge.