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off the trolley adj. 

 Describes the behavior of a
   program that malfunctions and goes catatonic, but doesn't actually
   crash or abort.  See glitch, bug, 

This term is much older than computing, and is (uncommon) slang
   elsewhere.  A trolley is the small wheel that trolls, or runs
   against, the heavy wire that carries the current to run a
   streetcar.  It's at the end of the long pole (the trolley pole)
   that reaches from the roof of the streetcar to the overhead line. 
   When the trolley stops making contact with the wire (from passing
   through a switch, going over bumpy track, or whatever), the
   streetcar comes to a halt, (usually) without crashing.  The
   streetcar is then said to be off the trolley, or off the wire. 
   Later on, trolley came to mean the streetcar itself.  Since
   streetcars became common in the 1890s, the term is more than 100
   years old.  Nowadays, trolleys are only seen on historic
   streetcars, since modern streetcars use pantographs to contact the