I was fascinated by Cally Soukup's 1999 newsgroup post about speech therapist Karyn Ashburn's talk at Minicon, discussing Karyn's observations of the speech patterns and behaviors of groups of people intensely interested in a particular field or hobby compared ("fandom", "fans", or "geeks") to non-fans or non-geeks.  I think these patterns will feel familiar to technologists.
Minicon Panel Report 
The best piece of programming I attended at Minicon was a panel, or rather a 
 lecture, by Karyn Ashburn, Elise Mattheson's sister.  She is a speech 
 therapist, with lots of initials after her name, who works with adult 
 populations, many of whom are nonverbal or barely verbal, and she isn't a 
 member of fandom.  As the sister of a member of fandom, however, she's had 
 an opportunity to observe us in one of our native habitats when meeting 
 Elise at conventions.  And as a non-fan and a person passionately interested 
 in speech production, she's noticed some common features in the way fans 
 verbally communicate. 
We were lucky in that she hadn't shown up for her panel at 5:00 on Saturday, 
 which would have been in a smallish function room and restricted to only an 
 hour.  Instead she was rescheduled for after closing ceremonies in the 
 ballroom, so a large fraction of the convention members had a chance to hear 
 her.  Because we wouldn't let her leave, her talk ended up being about 2 1/2 
 hours long, but she still left us with a lot of questions.  I recommend her 
 as a speaker to any convention.  The bare gist of what she said follows. 
On those occasions when she showed up at a con to meet Elise, she saw lots 
 of fans in groups talking.  To her they seemed angry and rude.  To Elise 
 they seemed nothing of the sort.  Observing them more closely, she realized 
 that they were using different social cues, different body language, 
 different eye contact, and even different ways of forming vowels than what 
 she jokingly called "my people", or what for convenience sake I'll call 
 mundanes.  She hastened to say she doesn't have a theory, or even yet much 
 of a hypothesis for why this may be (or a large enough sample size across 
 populations to prove that this is so), but she does have a lot of questions. 
She also seemed quite concerned that we would feel offended by what she had 
 to say, but what she told us was so interesting, and often so recognizably 
 true, that I don't think anyone was.  Of course everything that I'm about to 
 say is an overgeneralization; different fans possess these traits to greater 
 or lesser degrees. 
First, the mechanics of actual vocal production, especially vowels.  The 
 phonemes in the words "him" and "meet" are produced with the tounge in 
 various positions, and the lips stretched back.  The phonemes "uh" and "oh" 
 are produced with rounded lips.  This, at any rate, is the case in mundania. 
 Fans, she has noticed, push the vowels forward; rounding the lips somewhat 
 even for "ee" and "ih".  We use our lips a lot, but at the same time, we use 
 our cheeks and our chins not as often as would be expected.  We stabilize 
 the cheeks and the chin, and we "prolabialize". (When, while sitting at a 
 table, I leaned my chin on my hands while talking to her, she became 
 uncomfortable.  She can't do that easily; her chin moves more when she 
 speaks.) 
Second, fans articulate more than mundanes.  She had various of us stand up 
 and say things, and then repeated them in "mundane".  When I said the phrase 
 "talk to", she pointed out that I had pronounced the "k" on the end of 
 "talk".  Mundanes, she said, wouldn't.  We pronounce more of the terminal 
 consonents in a phrase than a typical mundane does.  We are more likely than 
 mundanes to pronounce the "h" in "where", and the "l" in "folk".  (She 
 seemed to think it was rather charming; that we were preserving old 
 pronounciations, or reinventing them from the way words are spelled.) 
We also speak in larger word groupings between breaths.  This does not 
 necessarily mean that we speak faster; we just pause for a shorter time 
 between words -- except where there is punctuation.  She pointed out that 
 when Teresa Nielsen Hayden said she came from Mesa, Arizona, Teresa actually 
 pronounced the comma by putting a slightly longer pause there, while most 
 mundanes would simply run the words together.  Mundanes slur a lot of 
 consonents that we pronounce individually.  We use punctuation in our spoken 
 utterances.  Sometimes we even footnote. 
What we say in those large word groupings is also different.  We tend to use 
 complete sentences, and complex sentence structure.  When we pause, or say 
 "uh", it tends to be towards the beginning of a statement, as we formulate 
 the complete thought.  The "idea" or "information" portion of a statement is 
 paramount; emotional reassurance, the little social noises (mm-hmm) are 
 reduced or omitted.  We get to the heart of what we want to say -- if 
 someone asks us how to do something we tell them, not leading up to it 
 gently with "have you tried doing it this way?" 
This leads us to body language.  Our body language is also different from 
 mundanes.  We tend to not use eye contact nearly as often; when we do, it 
 often signifies that it's the other person's turn to speak now.  This is 
 opposite of everyone else.  In mundania, it's *breaking* eye contact that 
 signals turn-taking, not *making* eye contact.  She demonstrated this on 
 DDB; breaking eye contact and turning slightly away, and he felt insulted. 
 On the other hand, his sudden staring at her eyes made her feel like a 
 professor had just said "justify yourself NOW".  Mutual "rudeness"; mixed 
 signals. 
We use our hands when we talk, but don't seem to know what to do with our 
 arms.  When thinking how to put something we close our eyes or look to the 
 side and up, while making little "hang on just a second" gestures to show 
 that we're not finished talking.  We interrupt each other to finish 
 sentences, and if the interrupter got it right, we know we've communicated 
 and let them speak; if they get it wrong we talk right over them.  This is 
 not perceived as rude, or not very rude. 
We accept corrections on matters of fact and of pronunciation; when I asked 
 her about whether fanspeak might be related to Asperger's Syndrome, and 
 mispronounced "Asperger's", I was corrected in mid-sentence by the man 
 sitting next to me, corrected myself, thanked him, and finished the 
 sentence.  One Doesn't Do That in Mundania.  Fans understand that 
 mispronouncing words one has only read is very common in fandom, and not 
 mortally embarrassing. 
When we make a joke, we don't do a little laugh in the middle of a word to 
 signal that it's funny; we inhale and exhale a very fast, short breath at 
 the end of the sentence, rather like a suppressed beginning of a laugh, or a 
 kind of a gasp. 
She didn't get much into why this is all the case (I think she was surprised 
 at the laughter when she suggested diffidently that we might be a bit under 
 socialized.  No, really?? ), and turned away questions about possible 
 pathology.  While more comfortable with us now, I suspect she was probably 
 still worried about offending us.  She did suggest that many of the common 
 features of fanspeak seem to be related to thinking in "written English". 
The day before, while waiting for her sister to show up, Elise had suggested 
 that perhaps the overuse of the lips and underuse of cheeks and chin had 
 come from very small children wanting to communicate complex ideas to 
 grownups; the facial muscles still being underdeveloped, the easiest way to 
 articulate would be to concentrate on the lips, holding the cheeks and chin 
 still as a way to reduce the complexity of word formation.