evil

Nothing is either good or bad but thinking makes it so -- Hamlet

http://i.imgur.com/95IVsDF.gif

See Also

Bad Thing

Description

In computer programming, evil is that which leads unpredictably to deviant behaviour. It is invoked by the the actor that plays the wrong role, the conductor that embarks upon the wrong score, and by that member of the cherished public who pulls the fire alarm after the lights have gone down and the curtain has gone up. Evil is waiting at the threshold of every condition, the boundary of every array, between the lines of every automatically-generated expression, script, and compilation unit. It sleeps within compiler optimisations and winds its way by flaws in the protocol and holes in the implementation through the nodes of the network. Evil is that which is undefined, that which is poorly defined, and that definition which is ignored. It's the wrong time, the wrong place, the face that's lovely, but the wrong face.

Evilness

combinatorial explosion
The enemy within and the road to enlightenment.
DoS
Demons from Outer Space.
eval
The gateway to hell.
goto
Maybe it's evil, or maybe it's just misunderstood.
code injection
This one is a doozy.
Microsoft
Evil Incorprated.
object-oriented programming
Will turn you into a Marxist, or at least a newt.
premature optimisation
http://www-cs-faculty.stanford.edu/~uno/don.gif https://upload.wikimedia.org/wikipedia/en/1/16/Drevil_million_dollars.jpg
race conditions
The vampires of the programming world.
Richard Stallman
Pulled a Kruschchev on John
self-modifying code
Simply twisted .
side effects
The bane of functional programmers
surrogate pairs
The true evil twins.
Update
Masquerading as a little friend.