Yes I know that one person’s general weirdo is another person’s hero, but seriously, in your life and work experience what real life job, profession or avocation has the highest concentration of people that would be probably be seen as seriously socially maladjusted outside their job?
Jobs done by institutionalized people do not count in this context.
Lawyers, definitely. They are cruel, rude, and generally look down upon all of us lower life forms, the bastards. How do I know? Currently, I’m a docket clerk for a large law firm. Yes, there’s a few good apples, but the majority are the meanest SOBs to walk to face of the earth. I AM STILL A PERSON! I AM HUMAN! YOU CANNOT TRY TO SQUASH ME AND THEN SCRAPE ME OFF YOUR BOOT HEEL! JUST BECAUSE YOU FINISHED COLLEGE AND I’M JUST STARTING DOES NOT MAKE YOU INHERENTLY BETTER THAN ME!!
Sorry, just a little pent up anger there…
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Twitchy little things, the lot of 'em 
Make-up artists for corpses.
Actually, the funeral director where my husband works (who applies the makeup and whatnot) is quite a well-adjusted guy. You’ll find that most people who work in that industry are often quite a bit more sane (and incredibly more humorous!) than most other people. You get a few loonies here and there, but by far it’s not more than average. I’ve always told people that they haven’t been to a good party until they’ve been to a party with people from a funeral home. For hubby’s christmas party we all went to a well known brewery/steakhouse type of place. The dozen or so of them managed to drink the entire place dry of Jack Daniels. It was a hoot.
My first job was in a hospital closest to my home. I worked in the inpatient psychiatric ward - a locked unit. I learned two things.
A-People can make just about anything out of their own feces.
B-A Psychiatrists best friend is Haldol 5mg.
University Libraries. Note that I think this a point in favor of libraries.
I once took a job at a state mental hospital and was assigned to the Invol ward. This was a place to warehouse those folks that had no hope of ever returning to society. I quit 3 days later. It was like a horror movie to me.
So there is no mis-understanding, I am talking about the people that do the jobs not the people they care for or interact with in the course of that job.
Night watchmen. I apologize to the well-adjusted night watchmen who may be out there, but my experience is that people take that job when they have no other marketable skills, not much ambition, and really would rather be alone.
According to this movie with Matthew Perry and Bruce Willis (it takes place in Canada, I can’t think of the name of the thing)…dentists. In the movie, they say more dentists wind up committing suicide than the members of any other proffession.
Telemarketers. 
You wanna meet some of the people who ring you on the phone. Call-centres are the last refuge of those who would be admitted to nut-houses if only there were more beds available. 
Cecil already addressed the issue of whether dentists have the highest suicide rate.
Orange Skinner: the movie was The Whole Nine Yards and it takes place in and around my city, Montreal.
If anything, it suggested that members of organized crime (and their wannabe recruits) were pretty loopy.
Crack whore?
More seriously…cops. I know a few personally, and three guys I graduated with became cops. Two of them I’d classify as complete sociopaths (IANAP). The third one seems OK. The rest of the cops I know are among the most paranoid-seeming people I’ve ever met.
Professional politicians (I’ve done consulting for a few).
Sadly, it seems that those who pursue office most passionately are the most likely to abuse their power.
Well, I was both a night watchman and a telemarketer, and my shrink thinks I’m very well adjusted.
Seriously, the night watchman job was great. It was an easy job to get when I first got into that particular town, so I took it while I searched for other work. Once I did find a better-paying job, I kept the security job as well because it was easy. I mean, I got paid to read! A number of my co-workers were college students. I myself at the time had marketable skills and marketed them successfully. Most everybody there was pretty intelligent and well-adjusted.
The telemarketing thing . . . well . . . okay, I must admit, there were some real looney tunes manning the phones at the two telemarketing companies for which I worked. Still, not everybody was crazy.
The occupations which seem to attract the most maladjusted people in my experience are: cops, nurses, paramedics, mental health workers (from the minimum wage student workers right on up to the guys with all the M.D.s and Ph.D.s after their names), strippers, human resource personel, factory workers, cashiers, certain military occupations, and writers. Oh, and college is full of not-quite-right people. I don’t know who is worse–that is, stranger–the students or the faculty.
Please don’t flame me. I’ve got friends in all the fields I mentioned except for human resources, and I’ve done a couple of those jobs myself. I think that most fields have quite a few people with loose screws and you’re bound to run in to quite a few nutjobs in any job that routinely employs humans. What would be interesting is to find a job dominated by people who aren’t nuts in some way.
While I personally know a decent cop, I have had enough experience to know that there are a lot of people who get into law enforcement or security work because they are working through some issues about power and getting to be in charge.
Or even worse, Assistant Crack Whore.