Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed Northerners may not understand this warning sign, and their heads laughed