From: Raymond E. Feist
Date: Thu, 05 Sep 1996 
Subject: Re: Rifts

If you bring too much magic too close together, you run the risk of creating a rift. We once had a game begin with two guys who hadn't seen one another for a while shaking hands, each carrying 5 items. They blew up. Accidental rifts tend to be unstable and don't stick around very long.