Some chess players are notorious for having bad tempers, although I assume the ratio of angry chess players is no better or worse than the ratio of angry people in society. There have of course been occasions where games have resulted in violence (eg at the Doeberl Cup some years back), so it is always interesting when similar incidents happen in similar (but non-chess) environments.
For example, a monopoly player has been arrested for starting a brawl at a Monopoly tournament in the United States. In a scenario that chess organisers might be able to sympathise with, the player concerned had previous 'form', including being expelled from the previous years event. Despite being asked no to attend, the player turned up anyway, and predictably, trouble ensued.
Oddly, when tracking down the link for this event (using the search teams 'monopoly player arrested') I came across a number of other cases where playing Monopoly lead to trouble. In a few cases knives were involved, although the most hilarious case involved a game of 'strip monopoly' getting out of hand, with a jealous girlfriend landing one on a fellow player who was making eyes at her boyfriend.
So while chess isn't perfect in the behaviour stakes, it is at least good to know we aren't alone with the crazy!