(Christian eschatological myth) 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 got (when you
are not).
E.g. "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
hard-coded a buffer size."