The relationship among bugs, features, misfeatures, warts, and miswarts might be clarified by the following hypothetical exchange between two hackers on an airliner:
A: "This seat doesn't recline."
B: "That's not a bug, that's a feature. There is an emergency exit door built around the window behind you, and the route has to be kept clear."
A: "Oh. Then it's a misfeature; they should have increased the spacing between rows here."
B: "Yes. But if they'd increased spacing in only one section it would have been a wart — they would've had to make nonstandard-length ceiling panels to fit over the displaced seats."
A: "A miswart, actually. If they increased spacing throughout they'd lose several rows and a chunk out of the profit margin. So unequal spacing would actually be the Right Thing."
B: "Indeed."
`Undocumented feature' is a common, allegedly humorous euphemism for a {bug}. There's a related joke that is sometimes referred to as the "one-question geek test". You say to someone "I saw a Volkswagen Beetle today with a vanity license plate that read FEATURE". If he/she laughs, he/she is a geek (see {computer geek}, sense #2).
:feature creature: /n./ [poss. fr. slang `creature feature' for a horror movie] 1. One who loves to add features to designs or programs, perhaps at the expense of coherence, concision, or {taste}. 2. Alternately, a mythical being that induces otherwise rational programmers to perpetrate such crocks. See also {feeping creaturism}, {creeping featurism}.
:feature key: /n./ The Macintosh key with the cloverleaf graphic on its keytop; sometimes referred to as `flower', `pretzel', `clover', `propeller', `beanie' (an apparent reference to the major feature of a propeller beanie), {splat}, or the `command key'. The Mac's equivalent of an {alt} key. The proliferation of terms for this creature may illustrate one subtle peril of iconic interfaces.