
Up in Michigan, a converted Keggle recently exploded during a mass brew session. Basically, the bottom rim had no airholes, and it gathered enough pressure to cause an explosion.
If you are using a keg, check the bottom to ensure that this won't happen to you.
Here is the thread in the Northern Brewer forum:
http://forum.northernbrewer.com/viewtopic.php?t=44238&postdays=0&postorder=asc&start=0
Here are the pictures taken by one of the brewers that was there
http://picasaweb.google.com/wskellenger/BigBrew2007
Moderator: PLEASE STICKY THIS POST!!!