I've never been to Defcon, but I've heard stories. Thus, this exchange I saw on IRC whilst lurking was amusing:

[3:12pm] <shiruken> hey, there are 2 rules of Defcon
[3:12pm] <shiruken> 1. Drink lots of fluid
[3:12pm] <shiruken> 2. Wipe your whole laptop and start                                     
over when you get home