Our favorite gypsy trucker is partaking in a humanitarian operation in Central America. At the border, he's stopped by nurses from the military health service. Like all new arrivals, Gypsy is vaccinated against "Aztec Laughter," the deadly virus ravaging the population, of which the symptoms include fits of extreme violence. In the first town he stops at, Gypsy finds a bunch of half-crazed zombies and suicidal dancers: they've all been infected with the pernicious disease. He