: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."
-- The AI Hackers Dictionary