- have someone begin by saying a letter of the alphabet out loud. this is the 'getopt' letter.
- the next person in the circle must come up with a unix command which uses that letter as an option. further, the command and the purpose of the option must be described.
- go to the next person, using the last letter of the previous unix command as the new 'getopt' letter.
- as people fail to name a unix command, that person must drop out.
now, replace the term "drop out" with "take a shot" or "pound a beer" and you have the next great defcon drinking game.