When you get a bunch of people together who like being pedantic, there seems to be a profusion of logical fallacies. Prepare yourself to spot, and debunk them:

Logical Fallacy collections:

• The Nizkor Project: http://www.nizkor.org/features/fallacies/
• Stephan's Guide: http://www.intrepidsoftware.com/fallacy/welcome.htm
• The Fallacy Files: http://gncurtis.home.texas.net/index.html