line 666

line 666 [from Christian eschatological myth] n.  The
   notional line of source at which a program fails for obscure
   reasons, implying either that *somebody* is out to get it
   (when you are the programmer), or that it richly deserves to be so
   gotten (when you are not).  "It works when I trace through it, but
   seems to crash on line 666 when I run it."  "What happens is that
   whenever a large batch comes through, mmdf dies on the Line of the
   Beast.  Probably some twit hardcoded a buffer size."