In July 2010, two Comic-Con attendees tussled over a seat and one stabbed the other’s eye with a pen. Want more details? See http://www.usatoday.com/life/2010-07-24-comic-con-stabbing_N.htm.
While this is the first time something like this happened at Comic-Con (by far the largest comics/graphic fiction/super hero event in the United States), we’re not familiar with anything remotely like it occurring within the academic environment in which we work.
However, it did make us think. While nothing could seem more out of place than two conference attendees coming to blows at an academic conference it really would not take much to create a potential scenario.
You really all you need two things to create havoc at any event -- the right environment and the right spark.