In this article, the author presents the top-10 list of campus computer-security risks he compiled based on several recent computing surveys and interviews with more than a dozen college-technology leaders. The list, ordered from least to most serious, is by no means scientific, but it gives a sense of where today's battle lines are--and why "phish" costumes should become more common on campuses. These threats to computer security are: (10) Spammers; (9) Cellphones; (8) Phishers; (7) Social Networks; (6) Outsource Partners; ((5) Students; (4) Professors; (3) Staff Members; (2) Thieves; and (1) Malware and Botnets.