'''http://i.imgur.com/95IVsDF.gif%|%evil'''? Nothing is either good or bad but [http://www.opensourceshakespeare.org/views/plays/play_view.php?WorkID=hamlet&Act=2&Scene=2&Scope=scene%|%thinking makes it so], but let's see ... [https://en.wikipedia.org/wiki/Combinatorial_explosion%|%combinatorial explosion]: The enemy within and the road to enlightenment. `[DoS]`: Demons from Outer Space. `[eval]`: The gateway to [hell]. [Why Tcl has no GOTO command%|%goto]: Maybe it's evil, or maybe it's just misunderstood. [injection attack%|%code injection]: This one is a doozy. [Microsoft]: Evil Incorprated. [object orientation%|%object-oriented programming]: Will turn you into a Marxist, or at least a newt. [http://www.paulgraham.com/knuth.html%|%premature optimisation]: [http://www-cs-faculty.stanford.edu/~uno/don.gif] [https://upload.wikimedia.org/wikipedia/en/1/16/Drevil_million_dollars.jpg] [race condition%|%race conditions]: The vampires of the programming world. [Richard Stallman]: [http://oreilly.com/openbook/freedom/ch11.html%|%Pulled] a [https://en.wikipedia.org/wiki/Shoe-banging_incident%|%Kruschchev] on [John Ousterhout%|%John] [self-modifying code]: Simply twisted . side effects: The bane of [functional programming%|%functional programmers] [Unicode%|%surrogate pairs]: The true evil twins. [Update considered harmful%|%Update]: Masquerading as a little friend. ** See Also ** [Bad Thing]: <> design