Self Destruction
From Nighthawks Shadowrun Wiki
When one or more members of the 'team' get annoyed at how the game is progressing and decide to kill the other party members. Associated chaos and much shouting ensues followed by someone leaving in a huff. Happens about once every 4-5 runs.
See the (subsequently re-edited) details of Whats Inside Box Number Three for a superb example of this phenomena.