T-Shirts: man, despair, problem, zero, one, binary, binary code, crash, administrator, attack, infestation, infested, operating system, screen, code, computer, computer security, computer viruses, computer virus, data, data exchange, information superhighway, data theft, theft, display, electronic brain, elektronenrechenmaschine, danger, hacker, infected, computer science, network, communication, monitor, programmer, system, transfer, trojan, transmission, networking, viruses, virus scanner, virus protection, virus, virus warning, warning, web, digital, numbers