Quote: "Perhaps they should write their Social Security numbers on their arms with indelible ink." Louisiana Governor Kathleen Blanco
Figure of Speech: apagoresis (ah pah gore EE sis), the "better not" figure
An apagoresis works to talk someone out of doing something. Blanco uses an ironic version of it--implying that Social Security numbers will help identify the corpses--to dissuade coastal residents from sitting out Hurricane Rita.
Snappy Answer: "They should also include their Lotto number. It beats FEMA debit cards."